Allow reordered MAKEFLAGS

-R and -r (-Rr) can be reordered to -r and -R (-rR).
This happens with MSYS1/2 gnu-make and mingw32-make,
and triggers "Recursion detected, bailing out..."

Signed-off-by: Ray Donnelly <mingw.android@gmail.com>
Message-Id: <CAOYw7dsdsg-XaDOwwEWJeUUSo2Vu_UD5GtkSgNTu59ai7yx0cQ@mail.gmail.com>
Patchwork-Id: 258027

CT_EXPERIMENTAL=y

CT_LOCAL_TARBALLS_DIR="${HOME}/src"

CT_SAVE_TARBALLS=y

CT_LOG_EXTRA=y

CT_ARCH_ARCH="i686"

CT_ARCH_x86=y

CT_KERNEL_windows=y

CT_BINUTILS_V_2_21_1a=y

CT_BINUTILS_PLUGINS=y

CT_CC_V_4_5_2=y

CT_CC_LANG_CXX=y

CT_MINGW_DIRECTX=y

CT_MINGW_DDK=y

CT_GMP_V_4_3_2=y

CT_MPFR_V_2_4_2=y

CT_PPL_V_0_10_2=y

CT_CLOOG_V_0_15_10=y