refactor the HAVE_WC_INTROSPECTION mechanism to pass build params via $output_objdir/.build_params rather than abusing autotools config.h to pass them;
add support for EXTRA_CFLAGS on the make command line;
in FIPS builds, exclude pkcallbacks from --enable-all;
linuxkm: move test.o out of PIE container (uses function pointers as operands).