android: use original .bin for native modules

Uses the original project's .bin folder when building native modules
for Android. Gradle's copy tasks resolve the symbolic links instead
of preserving them, which causes fails while building modules that
depend on linked build tools, such as node-pre-gyp. With this change,
the native modules build step will try to use the original project's
linked binaries.

android/build.gradle

@@ -255,6 +255,9 @@ if ("1".equals(shouldRebuildNativeModules)) {
                 copy {
                     from "${rootProject.projectDir}/../nodejs-assets/nodejs-project/"
                     into "${rootProject.buildDir}/nodejs-native-assets-temp-build/nodejs-native-assets-${abi_name}/nodejs-project/"
+                    // Symlinks to binaries will be resolved by Gradle during the copy, causing build time errors.
+                    // The original project's .bin folder will be added to the path while building in the BuildNpmModules tasks.
+                    exclude "**/.bin"
                 }
                 if (OperatingSystem.current().isMacOsX()) {
                     // Copy the helper scripts for calling npm and node when building in Android Studio on macOS.
@@ -302,6 +305,15 @@ if ("1".equals(shouldRebuildNativeModules)) {
             environment ('npm_config_arch', temp_arch)
             environment ('npm_config_platform', 'android')
             environment ('npm_config_format', 'make-android')
+
+            // Adds the original project .bin to the path. It's a workaround
+            // to correctly build some modules that depend on symlinked modules,
+            // like node-pre-gyp.
+            String original_project_bin = "${rootProject.projectDir}/../nodejs-assets/nodejs-project/node_modules/.bin";
+            if(file(original_project_bin).exists()) {
+                environment ('PATH', "${original_project_bin}" + System.getProperty("path.separator") + "${System.env.PATH}")
+            }
+
             environment ('TOOLCHAIN',"${standalone_toolchain}")
             environment ('AR',"${npm_toolchain_ar}")
             environment ('CC',"${npm_toolchain_cc}")