Use CMake+Gfortran to install stdlib in Win10.

[GasinAn]

GCC Fortran(MinGW), 8.1.0, Windows 10, x86_64: SUCCEEDED.
The following tests FAILED:
8 - loadtxt_qp (Failed)
9 - savetxt_qp (Failed)
GCC Fortran(MSYS2), 5.3.0, Windows 10, x86_64: FAILED.
Messages after "configure build" and "build" is in TXT files:
configure_build.gfortran_5.3.0_MSYS2.Win10.x86_64.txt
build.gfortran_5.3.0_MSYS2.Win10.x86_64.txt

[Romendakil]

Not surprising, F2018 error stop was (partially) implemented only for gfortran 7, it cannot work in 5.3.0. Why is 5.3 tested at all, if so to me only the final version of the gfortran 5 series, gfortran 5.5.0 makes sense. But the last supported gcc version is 8 atm.

[awvwgk]

I would hazard a guess that the 8.1.0 version comes from choco (https://community.chocolatey.org/packages/mingw/8.1.0) while the 5.3.0 version is conda-forge's redistributed MSYS2 toolchain (https://anaconda.org/conda-forge/m2w64-gcc-fortran), which has been pretty much stale since MSYS2 stopped distributing on anaconda.org. Both choco and conda-forge are not really reliable channels for getting up-to-date GCC versions on Windows (alternatives are described at https://fortran-lang.org/learn/os_setup/install_gfortran).