Fix gil relinquishment

tools/distrib/python/grpcio_tools/grpc_tools/_protoc_compiler.pyx

@@ -37,8 +37,8 @@ cdef extern from "grpc_tools/main.h" namespace "grpc_tools":
     string message
 
   int protoc_main(int argc, char *argv[])
-  int protoc_get_protos(char* protobuf_path, vector[string]* include_path, vector[pair[string, string]]* files_out, vector[cProtocError]* errors, vector[cProtocWarning]* wrnings) except +
+  int protoc_get_protos(char* protobuf_path, vector[string]* include_path, vector[pair[string, string]]* files_out, vector[cProtocError]* errors, vector[cProtocWarning]* wrnings) nogil except +
-  int protoc_get_services(char* protobuf_path, vector[string]* include_path, vector[pair[string, string]]* files_out, vector[cProtocError]* errors, vector[cProtocWarning]* wrnings) except +
+  int protoc_get_services(char* protobuf_path, vector[string]* include_path, vector[pair[string, string]]* files_out, vector[cProtocError]* errors, vector[cProtocWarning]* wrnings) nogil except +
 
 def run_main(list args not None):
   cdef char **argv = <char **>stdlib.malloc(len(args)*sizeof(char *))
@@ -109,8 +109,7 @@ def get_protos(bytes protobuf_path, list include_paths):
   cdef vector[cProtocError] errors
   # NOTE: Abbreviated name used to avoid shadowing of the module name.
   cdef vector[cProtocWarning] wrnings
-  with nogil:
+  rc = protoc_get_protos(protobuf_path, &c_include_paths, &files, &errors, &wrnings)
-    rc = protoc_get_protos(protobuf_path, &c_include_paths, &files, &errors, &wrnings)
   _handle_errors(rc, &errors, &wrnings, protobuf_path)
   return files