Merge pull request #187 from jasmin-j/sync_lto

Synchronize CC_GCC_USE_LTO parameter setting II

scripts/build/cc/100-gcc.sh

@@ -772,8 +772,10 @@ do_gcc_backend() {
     fi
     if [ "${CT_CC_GCC_USE_LTO}" = "y" ]; then
         extra_config+=("--with-libelf=${complibs}")
+        extra_config+=("--enable-lto")
     elif [ "${CT_CC_GCC_HAS_LTO}" = "y" ]; then
         extra_config+=("--with-libelf=no")
+        extra_config+=("--disable-lto")
     fi
 
     if [ ${#host_libstdcxx_flags[@]} -ne 0 ]; then