Properly handle C_WARNINGS_SWITCH, PROFILING_CFLAGS, PROFILING_LDFLAGS

Properly handle C_WARNINGS_SWITCH, PROFILING_CFLAGS, PROFILING_LDFLAGS

* configure.in (C_WARNINGS_SWITCH, PROFILING_CFLAGS)
(PROFILING_LDFLAGS): Substitute, don't add them to CFLAGS/LDFLAGS.
(C_OPTIMIZE_SWITCH): Remove.
(TEMACS_LDFLAGS2): Add ${PROFILING_LDFLAGS}.

* lib-src/Makefile.in (C_WARNINGS_SWITCH, PROFILING_CFLAGS)
(PROFILING_LDFLAGS): Set from substitution.
(BASE_CFLAGS): Add  ${C_WARNINGS_SWITCH}.
(ALL_CFLAGS, CPP_CFLAGS): Add ${PROFILING_CFLAGS}.
(LINK_CFLAGS): Add ${PROFILING_LDFLAGS}.

* lwlib/Makefile.in (C_WARNINGS_SWITCH, PROFILING_CFLAGS): Set from
substitution.
(ALL_CFLAGS): Add ${C_WARNINGS_SWITCH} and ${PROFILING_CFLAGS}.

* oldXMenu/Makefile.in (C_WARNINGS_SWITCH, PROFILING_CFLAGS): Set from
substitution.
(ALL_CFLAGS): Add ${C_WARNINGS_SWITCH} and ${PROFILING_CFLAGS}.

* src/Makefile.in (C_WARNINGS_SWITCH, PROFILING_CFLAGS)
(PROFILING_LDFLAGS): Set from substitution.
(ALL_CFLAGS): Add C_WARNINGS_SWITCH and PROFILING_CFLAGS, put
CFLAGS last.