Do not symlink build-tools directory

Due to latest changes in Android runtime, we can no longer symlink `build-tools` directory from the runtime when `--symlink` is passed.
There are two major reasons:
- There are `.js` files in the build-tools, which use `require(<smth>)`. This is failing as node's searching for the installed modules from the original location of the file.
- During build, new files are generated in the build-tools directory. As they are unique (each one is project specific), we cannot symlink them.

Author: rosen-vladimirov

lib/services/android-project-service.ts

@@ -117,10 +117,9 @@ export class AndroidProjectService extends projectServiceBaseLib.PlatformProject
 			let targetSdkVersion = androidToolsInfo.targetSdkVersion;
 			this.$logger.trace(`Using Android SDK '${targetSdkVersion}'.`);
 			if(this.$options.symlink) {
-				this.symlinkDirectory("build-tools", this.platformData.projectRoot, frameworkDir).wait();
 				this.symlinkDirectory("libs", this.platformData.projectRoot, frameworkDir).wait();
 			} else {
-				this.copy(this.platformData.projectRoot, frameworkDir, "build-tools libs", "-R");
+				this.copy(this.platformData.projectRoot, frameworkDir, "libs", "-R");
 			}
 
 			// These files and directories should not be symlinked as CLI is modifying them and we'll change the original values as well.
@@ -129,7 +128,7 @@ export class AndroidProjectService extends projectServiceBaseLib.PlatformProject
 				this.$fs.createDirectory(mainPath).wait();
 				shell.cp("-R", path.join(path.resolve(pathToTemplate), "*"), mainPath);
 			} else {
-				this.copy(this.platformData.projectRoot, frameworkDir, "src", "-R");
+				this.copy(this.platformData.projectRoot, frameworkDir, "src build-tools", "-R");
 			}
 			this.copy(this.platformData.projectRoot, frameworkDir, "build.gradle settings.gradle gradle.properties", "-f");