Revert "Pass preprocessor options to C compiler when building foreign C files (#16737)"
This reverts commit 1c18d3b4.
-optP
should pass options to the preprocessor, that might be a very
different program to the C compiler, so passing the options to the C
compiler is likely to result in -optP
being useless.
Fixes #17185 (closed) and #21291 (closed)