Suppress export name minification (#95613)

By default in specific circumstances emscripten will minify export names, which breaks things like getRawCwrap. We can suppress this with `-lexports.js`.
Fixes #94939. See emscripten-core/emscripten#20762

src/mono/wasm/build/WasmApp.Native.targets

@@ -255,7 +255,7 @@
       <!-- Adding optimization flag at the top, so it gets precedence -->
       <_EmccLDFlags Include="$(EmccLinkOptimizationFlag)" />
       <_EmccLDFlags Include="@(_EmccCommonFlags)" />
-      <_EmccLDFlags Include="-s EXPORT_ES6=1" />
+      <_EmccLDFlags Include="-s EXPORT_ES6=1 -lexports.js" />
       <_EmccLDFlags Condition="'$(WasmEnableExceptionHandling)' != 'false'" Include="-s EXPORT_EXCEPTION_HANDLING_HELPERS=1"   />
 
       <_DriverCDependencies Include="$(_WasmPInvokeHPath);$(_WasmICallTablePath)" />

src/mono/wasm/wasm.proj

@@ -374,7 +374,8 @@
       <CMakeConfigurationLinkFlags Condition="'$(Configuration)' == 'Debug'"  >$(CMakeConfigurationEmccFlags) -s ASSERTIONS=1 </CMakeConfigurationLinkFlags>
       <CMakeConfigurationLinkFlags Condition="'$(Configuration)' == 'Release'">-O2</CMakeConfigurationLinkFlags>
 
-      <CMakeConfigurationLinkFlags>$(CMakeConfigurationLinkFlags) -s EXPORT_ES6=1</CMakeConfigurationLinkFlags>
+      <!-- -lexports.js has the magical property of disabling minification of export names -->
+      <CMakeConfigurationLinkFlags>$(CMakeConfigurationLinkFlags) -s EXPORT_ES6=1 -lexports.js</CMakeConfigurationLinkFlags>
       <CMakeConfigurationLinkFlags Condition="'$(WasmEnableSIMD)' == 'true'">$(CMakeConfigurationLinkFlags) -msimd128</CMakeConfigurationLinkFlags>
       <CMakeConfigurationLinkFlags Condition="'$(MonoWasmThreads)' == 'true'">$(CMakeConfigurationLinkFlags) -Wno-pthreads-mem-growth</CMakeConfigurationLinkFlags>
       <CMakeConfigurationLinkFlags                                            >$(CMakeConfigurationLinkFlags) --emit-symbol-map</CMakeConfigurationLinkFlags>