PS-7622: Improve prepend_cflags_if_supported cmake macro
PS-7622: Improve prepend_cflags_if_supported cmake macro

https://jira.percona.com/browse/PS-7622

Compilation on some platforms fails because of unsupported
no-suggest-override flag.
Improve prepend_cflags_if_supported macro to remove unsupported
flag from CMAKE_C_FLAGS or CMAKE_CXX_FLAGS in case it is present
there already.
Rename the macro to prepend_cflags_if_supported_remove_unsupported
to clearly show its purpose.

percona/PerconaFT,percona/PerconaFT,percona/PerconaFT,percona/PerconaFT