Fix module resolution when not built from source

Turns out the package.json generated inside our build directory confused
the module root detection in the `bindings` package. This means that our
search path was actually wrong, and relied on this being misdetected.

meson.build

@@ -84,19 +84,7 @@ frida_core_dep = dependency('frida-core-1.0', default_options: [
 
 pkg_install_dir = get_option('libdir') / 'node_modules' / 'frida'
 
-package_json = custom_target('package.json',
-  input: 'package.json',
-  output: 'package.json',
-  command: [
-    python,
-    files('scripts' / 'adjust-version.py'),
-    version,
-    '@INPUT@',
-    '@OUTPUT@',
-  ],
-  install: true,
-  install_dir: pkg_install_dir,
-)
+package_json = files('package.json')
 tsconfig_json = files('tsconfig.json')
 
 subdir('src')

src/assets/meson.build

@@ -0,0 +1,13 @@
+adjusted_package_json = custom_target('package.json',
+  input: package_json,
+  output: 'package.json',
+  command: [
+    python,
+    files('adjust-version.py'),
+    version,
+    '@INPUT@',
+    '@OUTPUT@',
+  ],
+  install: true,
+  install_dir: pkg_install_dir,
+)

src/frida_bindgen/codegen.py

@@ -57,7 +57,7 @@ def generate_ts(model: Model) -> str:
 const binding: FridaBinding = bindings({
     bindings: "frida_binding",
     try: [
-        ["module_root", "bindings"],
+        ["module_root", "build", "bindings"],
         [process.cwd(), "bindings"],
     ]
 });"""

src/meson.build

@@ -1,3 +1,5 @@
+subdir('assets')
+
 if frida_core_dep.type_name() == 'internal'
   frida_core_subprj = subproject('frida-core')
   frida_gir = frida_core_subprj.get_variable('core_public_gir')
@@ -78,7 +80,7 @@ custom_target('js',
     '@OUTDIR@',
     '@PRIVATE_DIR@',
     npm,
-    package_json,
+    adjusted_package_json,
     tsconfig_json,
     '@INPUT@',
   ],