Revert "Allow "clangd.path" to point to a shell script (clangd#708)"

This reverts commit 0c2d40d.

src/clangd-context.ts

@@ -69,7 +69,7 @@ export class ClangdContext implements vscode.Disposable {
     const clangd: vscodelc.Executable = {
       command: clangdPath,
       args: await config.get<string[]>('arguments'),
-      options: {cwd: vscode.workspace.rootPath || process.cwd(), shell: true}
+      options: {cwd: vscode.workspace.rootPath || process.cwd()}
     };
     const traceFile = config.get<string>('trace');
     if (!!traceFile) {