[arch-general] [PATCH]:[Clang] Add -fno-plt, -fplt to ignored flags

In GCC there is a -fno-plt flag not implemented in Clang which results in compilation failure: clang-4.0: error: unknown argument: '-fno-plt' Proposed patch adds -fno-plt and -fplt to existing ignored flags list making it compatible with gcc for package building. You can see more info about those flags in gcc manual: https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/Code-Gen-Options.html#Code-Gen-... Thank you for your attention. Jordan Glover