Fix #14025 (Makefile: make clean does not remove frontend object files) (cppcheck-opensource#7683)

Author: danmar

Makefile

@@ -375,7 +375,7 @@ run-dmake: dmake
 	./dmake
 
 clean:
-	rm -f build/*.cpp build/*.o lib/*.o cli/*.o test/*.o tools/dmake/*.o externals/*/*.o testrunner dmake cppcheck cppcheck.exe cppcheck.1
+	rm -f build/*.cpp build/*.o lib/*.o cli/*.o frontend/*.o test/*.o tools/dmake/*.o externals/*/*.o testrunner dmake cppcheck cppcheck.exe cppcheck.1
 
 man:	man/cppcheck.1
 

tools/dmake/dmake.cpp

@@ -795,7 +795,7 @@ int main(int argc, char **argv)
     fout << "run-dmake: dmake\n";
     fout << "\t./dmake" << (release ? " --release" : "") << "\n\n"; // Make CI in release builds happy
     fout << "clean:\n";
-    fout << "\trm -f build/*.cpp build/*.o lib/*.o cli/*.o test/*.o tools/dmake/*.o externals/*/*.o testrunner dmake cppcheck cppcheck.exe cppcheck.1\n\n";
+    fout << "\trm -f build/*.cpp build/*.o lib/*.o cli/*.o frontend/*.o test/*.o tools/dmake/*.o externals/*/*.o testrunner dmake cppcheck cppcheck.exe cppcheck.1\n\n";
     fout << "man:\tman/cppcheck.1\n\n";
     fout << "man/cppcheck.1:\t$(MAN_SOURCE)\n\n";
     fout << "\t$(XP) $(DB2MAN) $(MAN_SOURCE)\n\n";