c_examples/uname: print potential uname() error
c_examples: skip openmp programs if its support is broken at compiler level
c_examples/cpuid: fail nicely when compiled for something else than x86
nolibc: force -nostdlib flag when LDFLAGS is set in make parameters
mbr/syslinux-mbr: skip compilation if compiler doesn't support x86 instruction set
mmap-wx: no longer print open error when running on an old kernel
mmap-wx: support ARM architecture