Partially revert "Merge commit '71a49fe2'"

Revert back to the test as done by commit af7a75cb,
where it was changed to compile and not just preprocess to fix build failures on
FreeBSD with gcc 4.7
Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -4833,7 +4833,7 @@ check_cxxflags -std=c++11 || check_cxxflags -std=c++0x
 
 # some compilers silently accept -std=c11, so we also need to check that the
 # version macro is defined properly
-check_cpp_condition ctype.h  "__STDC_VERSION__ >= 201112L" -std=c11 &&
+test_cflags_cc -std=c11 ctype.h "__STDC_VERSION__ >= 201112L" &&
     add_cflags -std=c11 ||
     check_cflags -std=c99