File gn-always-python3.patch of Package gn

Index: gn-0.1616/src/gn/exec_process_unittest.cc
===================================================================
--- gn-0.1616.orig/src/gn/exec_process_unittest.cc
+++ gn-0.1616/src/gn/exec_process_unittest.cc
@@ -33,7 +33,7 @@ bool ExecPython(const std::string& comma
   args.push_back(L"-c");
   args.push_back(base::UTF8ToUTF16(command));
 #else
-  args.push_back("python");
+  args.push_back("python3");
   args.push_back("-c");
   args.push_back(command);
 #endif