autotools: don't pass all the libregress cflags to the scanner. Fixes #226
They contain things like -fvisibility=hidden which, in case of building with CFLAGS="-flto -O2" LDFLAGS="-Wl,--as-needed -flto", results in the linker throwing out unused symbols and not linking the dumper against libregress. This results in errors like: Invalid GType function: 'regress_test_enum_get_type' Failed to find symbol 'regress_test_enum_get_type' Fix this by only passing the required CFLAGS to the scanner instead.
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