Fix bfin-unknown-linux-uclibc sample.

Pin GCC to 4.5.3 and binutils to 2.22, the last versions working. There
are multiple bugs affecting bfin configuration; while [3] is fixed on
trunk in GCC (but not backported to gcc-5-release branch yet), [1] and
[2] do not have fixes yet.

References:
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=17334 (binutils bug)
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47779 (gcc bug #1)
[3] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55144 (gcc bug #2)

samples/bfin-unknown-linux-uclibc/crosstool.config

@@ -4,11 +4,12 @@ CT_LOG_EXTRA=y
 CT_ARCH_blackfin=y
 CT_KERNEL_linux=y
 CT_ARCH_BINFMT_FDPIC=y
+CT_BINUTILS_V_2_22=y
 CT_BINUTILS_PLUGINS=y
 CT_LIBC_uClibc=y
 CT_LIBC_UCLIBC_CONFIG_FILE="${CT_LIB_DIR}/samples/${CT_TARGET}/${CT_LIBC}-${CT_LIBC_VERSION}.config"
 CT_THREADS_LT=y
-CT_CC_V_4_5_3=y
+CT_CC_GCC_V_4_5_3=y
 # CT_CC_GCC_USE_GRAPHITE is not set
 # CT_CC_GCC_USE_LTO is not set
 CT_GMP_V_4_3_2=y