Support CMake style compiler feature checks

[NiklasRosenstein]

You often find code like this in CMake:

check_include_file(assert.h HAVE_ASSERT_H)
check_function_exists(calloc HAVE_CALLOC)
check_struct_has_member("struct timespec" tv_sec "time.h" HAVE_STRUCT_TIMESPEC)
check_c_source_compiles("
__thread int tls;
int main(void) {
    return 0;
}" HAVE_GCC_THREAD_LOCAL_STORAGE)
check_c_compiler_flag("-fvisibility=hidden" WITH_VISIBILITY_HIDDEN)
try_run()

Many libraries use these together with a CMake configuration header file. We can already render CMake config files using the cmake_configure_file() function in the utils.cmake package, but we lack the feature checks.

[NiklasRosenstein]

Added try_run()