cc/gcc: remove 'sub-level' version form symbols

Now we use defconfig files to store the samples, we have to be a bit more
conservatives in the symbols names, so as to avoid gigantic version bumps
when updating sub-level versions from a package.

For example (using fictitious versions):
- in crosstool-NG 1.17.0, we choose:
- latest gcc is gcc-linaro-4.7-2012.10, which is the default for the
choice in the menuconfig
- gcc-linaro-4.6-2012.10 is selected
- so, sample has an explicit symbol for the selected gcc version, as it
is not the default
- we update to crosstool-NG 1.18.0:
- latest gcc version is gcc-linaro-4.7-2013.01
- gcc-linaro-46 has been updated to gcc-linaro-4.6-2013.01
- as the sample now has no *valid* symbol to set the gcc version, the
default is used, while we would have expected to still use the 4.6
release from linaro, not the 4.7

Get rid of sub-level (ie. the third digit sequence in versions) from the
symbols for linaro versions.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

 # Wrapper to build the companion libs facilities

 # List all companion tools facilities, and parse their scripts

 CT_COMP_LIBS_FACILITY_LIST=

 for f in "${CT_LIB_DIR}/scripts/build/companion_libs/"*.sh; do

     _f="$(basename "${f}" .sh)"

     _f="${_f#???-}"

     . "${f}"

     CT_COMP_LIBS_FACILITY_LIST="${CT_COMP_LIBS_FACILITY_LIST} ${_f}"

 done

 # Download the companion libs facilities

 do_companion_libs_get() {

     for f in ${CT_COMP_LIBS_FACILITY_LIST}; do

         do_${f}_get

     done

 }

 # Extract and patch the companion libs facilities

 do_companion_libs_extract() {

     for f in ${CT_COMP_LIBS_FACILITY_LIST}; do

         do_${f}_extract

     done

 }

 # Build the companion libs facilities for build

 do_companion_libs_for_build() {

     for f in ${CT_COMP_LIBS_FACILITY_LIST}; do

         do_${f}_for_build

     done

 }

 # Build the companion libs facilities for host

 do_companion_libs_for_host() {

     for f in ${CT_COMP_LIBS_FACILITY_LIST}; do

         do_${f}_for_host

     done

 }