Compile time numbers with Ninja

[syntroniks]

s@PF1AJJFF:~/StratifyOS-newlib/build_arm$ cmake -G "Ninja" .. ; time ninja
real    1m10.819s
user    6m3.221s
sys     1m13.036s

Pretty darn good when it builds all these variants:

s@PF1AJJFF:~/StratifyOS-newlib/build_arm$ ls library/
CMakeFiles           libc_debug_v7em.a       libc_debug_v7em_f5dh.a  libc_debug_v7m.a     libc_release_v7em_f4sh.a  libc_release_v7em_f5sh.a  libm_debug_v7em.a       libm_debug_v7em_f5dh.a  libm_debug_v7m.a     libm_release_v7em_f4sh.a  libm_release_v7em_f5sh.a  src
cmake_install.cmake  libc_debug_v7em_f4sh.a  libc_debug_v7em_f5sh.a  libc_release_v7em.a  libc_release_v7em_f5dh.a  libc_release_v7m.a        libm_debug_v7em_f4sh.a  libm_debug_v7em_f5sh.a  libm_release_v7em.a  libm_release_v7em_f5dh.a  libm_release_v7m.a

I had to make some changes, however. I suspect it is the case-sensitivity of *NIX. PR incoming (shouldn't affect Windows builds)