almost there

meson.build

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+project('shiggy', 'c',
+    version: '1.0',
+)
+
+pymod = import('python')
+python = pymod.find_installation('python3', required: true)
+
+ar = find_program('ar')
+cc = meson.get_compiler('c')
+
+iggy_object_files = [
+    'ORBIS_rrAtomics.obj',
+    'ORBIS_rrCpu.obj',
+    'ORBIS_rrThreads.obj',
+    'ORBIS_rrTime.obj',
+    'as3_component_helpers.obj',
+    'as3vm.obj',
+    'as3vm_abc_decode.obj',
+    'as3vm_abc_dump.obj',
+    'as3vm_class.obj',
+    'as3vm_classes_base_dummy.obj',
+    'as3vm_classes_flash_dummy.obj',
+    'as3vm_convert.obj',
+    'as3vm_create.obj',
+    'as3vm_debugger_interface.obj',
+    'as3vm_dump_value.obj',
+    'as3vm_gc.obj',
+    'as3vm_imp_array.obj',
+    'as3vm_imp_math.obj',
+    'as3vm_imp_misc.obj',
+    'as3vm_imp_string.obj',
+    'as3vm_interpreter.obj',
+    'as3vm_names.obj',
+    'as3vm_op_strings.obj',
+    'as3vm_property.obj',
+    'as3vm_util.obj',
+    'as3vm_verifier.obj',
+    'avm2_microcode.obj',
+    'dtoa.obj',
+    'gr_strokepath.obj',
+    'iggy_allocation.obj',
+    'iggy_api_functions.obj',
+    'iggy_api_functions_global.obj',
+    'iggy_arena_allocator.obj',
+    'iggy_debug.obj',
+    'iggy_file_reader.obj',
+    'iggy_font_provider.obj',
+    'iggy_main.obj',
+    'iggy_mixer.obj',
+    'iggy_platform_audio.obj',
+    'iggy_platform_deps.obj',
+    'iggy_sound.obj',
+    'iggy_unicode.obj',
+    'radss_orbis.obj',
+    'rrCore.obj',
+    'rrMath.obj',
+    'rrMem.obj',
+    'rrSyncCheck.obj',
+    'rrstring.obj',
+    'stb_truetype_wrapper.obj',
+    'swf_as3_bitmap_data.obj',
+    'swf_as3_misc.obj',
+    'swf_as3_textfield.obj',
+    'swf_as3vm.obj',
+    'swf_as3vm_flash_display.obj',
+    'swf_as3vm_flash_events.obj',
+    'swf_cache.obj',
+    'swf_decode.obj',
+    'swf_draw.obj',
+    'swf_draw_filltype.obj',
+    'swf_draw_filter.obj',
+    'swf_draw_interface.obj',
+    'swf_draw_lib.obj',
+    'swf_draw_renderstate.obj',
+    'swf_draw_shape.obj',
+    'swf_draw_text.obj',
+    'swf_draw_texture.obj',
+    'swf_draw_triangulate.obj',
+    'swf_fontcache.obj',
+    'swf_jpeg.obj',
+    'swf_math.obj',
+    'swf_play.obj',
+    'swf_playhead.obj',
+    'swf_polygonalize.obj',
+    'swf_state.obj',
+    'triangulate_ears.obj',
+    'zlib.obj',
+]
+
+object_file_paths = []
+foreach file : iggy_object_files
+  object_file_paths += meson.current_build_dir() / file
+endforeach
+
+patched_object_files = []
+foreach file : iggy_object_files
+    patched_object_files += file.replace('.obj', '.o')
+endforeach
+
+
+unpack = custom_target(
+    'unpack-archive',
+    input: meson.project_source_root() / 'libs' / 'libiggy_orbis.a',
+    output: iggy_object_files,
+    command: [
+        ar,
+        'x',
+        '@INPUT@'
+    ],
+)
+
+patch_relocations = custom_target(
+    'patch-relocations',
+    input: object_file_paths,
+    output: patched_object_files,
+    command: [
+        python, meson.project_source_root() / 'scripts/patch_relocations.py',
+    ],
+)
+
+libshiggy = static_library(
+    'shiggy',
+    meson.project_source_root() / 'src' / 'shims.c',
+)
+
+custom_target(
+    'add-patched-objects',
+    input: [patch_relocations, libshiggy],
+    output: 'libshiggy.stamp',
+    command: [
+        ar,
+        'r',
+    ] + [libshiggy.full_path()] + patched_object_files + ['&&', 'touch', '@OUTPUT@'],
+    build_by_default: true,
+)

scripts/patch_relocations.py

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+import sys, struct, glob, shutil
+
+def patch_relocs():
+    patched = 0
+    for f in glob.glob("*.obj"):
+        outfile = f.replace('.obj', '.o')
+        shutil.copy(f, outfile)
+        
+        with open(outfile, 'rb+') as file:
+            file.seek(0)
+            if file.read(4) != b'\x7fELF': 
+                continue
+
+            file.seek(40) 
+            hdr = struct.unpack('<Q I 6H', file.read(24))
+            e_shoff, e_shentsize, e_shnum = hdr[0], hdr[5], hdr[6]
+
+            for i in range(e_shnum):
+                file.seek(e_shoff + i * e_shentsize)
+                shdr = struct.unpack('<I I Q Q Q Q I I Q Q', file.read(64))
+
+                if shdr[1] == 4: 
+                    sh_offset, sh_size, sh_entsize = shdr[4], shdr[5], shdr[9]
+
+                    for j in range(0, sh_size, sh_entsize):
+                        file.seek(sh_offset + j + 8) 
+                        r_info = struct.unpack('<Q', file.read(8))[0]
+
+                        if (r_info & 0xffffffff) == 40:
+                            new_info = (r_info & 0xffffffff00000000) | 9
+                            file.seek(sh_offset + j + 8)
+                            file.write(struct.pack('<Q', new_info))
+                            patched += 1
+
+    print(f"Patched {patched} 'type 40' relocations to standard GOTPCREL (9).")
+
+if __name__ == '__main__':
+    patch_relocs()