Revert "toolchain/gcc: use zstd from tools"

This reverts commit e6cc3ded0709aa6c7a190c31575bb5c19e204cd2.
Require more testing as it does cause compilation error.

Signed-off-by: Christian Marangi <[email protected]>

toolchain/gcc/common.mk

@@ -117,7 +117,6 @@ GCC_CONFIGURE:= \
 		--with-gmp=$(TOPDIR)/staging_dir/host \
 		--with-mpfr=$(TOPDIR)/staging_dir/host \
 		--with-mpc=$(TOPDIR)/staging_dir/host \
-		--with-zstd=$(TOPDIR)/staging_dir/host \
 		--disable-decimal-float \
 		--with-diagnostics-color=auto-if-env \
 		--enable-__cxa_atexit \