Patch compiler flags to fix build failures on GCC-based architectures:
cc1: error: unrecognized command line option "-Wno-unknown-warning-option" cc1: error: unrecognized command line option "-Wsuggest-attribute=noreturn" cc1: error: unrecognized command line option "-Wjump-misses-init"
Approved by: portmgr (tier-2 blanket)