[libc] fix missing dep

Author: SchrodingerZhu

libc/include/llvm-libc-types/CMakeLists.txt

@@ -7,7 +7,7 @@ add_header(__call_once_func_t HDR __call_once_func_t.h)
 add_header(__exec_argv_t HDR __exec_argv_t.h)
 add_header(__exec_envp_t HDR __exec_envp_t.h)
 add_header(__futex_word HDR __futex_word.h)
-add_header(__mutex_type HDR __mutex_type.h DEPENDS .__futex_word)
+add_header(__mutex_type HDR __mutex_type.h DEPENDS .__futex_word .pid_t)
 add_header(__pthread_once_func_t HDR __pthread_once_func_t.h)
 add_header(__pthread_start_t HDR __pthread_start_t.h)
 add_header(__pthread_tss_dtor_t HDR __pthread_tss_dtor_t.h)