all: fix wildcard to work with make-4.x

In make-3.8x, the $(wildacrd) function would sort the entries,
while in make-4.x, it would just return the entries in any
unpredictable order [*]

Use the $(sort) function to get reproducible behaviour.

[*] Well, most probably the roder the entries appear when read
from readdir()

Reported-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>

CT_EXPERIMENTAL=y

CT_LOCAL_TARBALLS_DIR="${HOME}/src"

CT_SAVE_TARBALLS=y

CT_LOG_EXTRA=y

CT_ARCH_CPU="cortex-m3"

CT_ARCH_TUNE="cortex-m3"

CT_ARCH_FLOAT_SW=y

CT_ARCH_arm=y

# CT_ARCH_USE_MMU is not set

CT_ARCH_ARM_MODE_THUMB=y

CT_TARGET_VENDOR="bare_newlib_cortex_m3_nommu"

CT_ARCH_BINFMT_FLAT=y

CT_BINUTILS_V_2_19_1a=y

CT_CC_V_4_4_1=y

CT_CC_LANG_CXX=y

CT_LIBC_NEWLIB_V_1_18_0=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_9=y