try adding gcc suffix support 7

_build.sh

@@ -1045,10 +1045,11 @@ build_single_target() {
     fi
   fi
 
+  _BINCORE_PREFIX="${_BINUTILS_PREFIX}"
   _BINCORE_SUFFIX="${_BINUTILS_SUFFIX}"
 
   if [ "${_CC}" = 'gcc' ] && [ -n "${_BINUTILS_SUFFIX}" ]; then
-    _BINUTILS_PREFIX="${_BINUTILS_PREFIX}gcc-"
+    _BINCORE_PREFIX="${_BINCORE_PREFIX}gcc-"
     _BINUTILS_SUFFIX=''
   fi
 
@@ -1112,9 +1113,9 @@ build_single_target() {
     # or clang-cl). Workaround: create an alias for it:
     ln -s -f "/usr/bin/clang${_CCSUFFIX}" "$(pwd)/clang"
   fi
-  export AR="${_BINUTILS_PREFIX}ar${_BINCORE_SUFFIX}"
-  export NM="${_BINUTILS_PREFIX}nm${_BINCORE_SUFFIX}"
-  export RANLIB="${_BINUTILS_PREFIX}ranlib${_BINCORE_SUFFIX}"
+  export AR="${_BINCORE_PREFIX}ar${_BINCORE_SUFFIX}"
+  export NM="${_BINCORE_PREFIX}nm${_BINCORE_SUFFIX}"
+  export RANLIB="${_BINCORE_PREFIX}ranlib${_BINCORE_SUFFIX}"
 
   # ar wrapper to normalize created libs
   if [ "${CW_DEV_CROSSMAKE_REPRO:-}" = '1' ]; then