Correct regex replace for PROJECT_DEPENDENCIES .h/.cpp

Author: tyeth

build_platform.py

@@ -396,7 +396,7 @@ def write_dependencies_to_header(dependencies, output_file):
         f.write('extern const char* project_dependencies;\n\n')
         f.write('#endif // PROJECT_DEPENDENCIES_H\n')
     # cpp file
-    with open(re.sub(r'\.h$','.cpp'), 'w') as f:
+    with open(re.sub(r'\.h$','.cpp', output_file), 'w') as f:
         f.write('#include "print_dependencies.h"\n\n')
         f.write('const char* project_dependencies = R"(\n')