toolchain: wrapper.sh: fix TOOLCHAIN_SYSROOT path

62c1740 changed the location of the script from $(TOOLCHAIN_DIR)/usr
to $(TOOLCHAIN_DIR), but the TOOLCHAIN_SYSROOT used in wrapper.sh was
still expecting to find the script under usr/bin.

Fixes: 62c1740 toolchain: fix the sysroot mess by getting...
Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

target/toolchain/files/wrapper.sh

@@ -46,7 +46,7 @@ TOOLCHAIN_BIN_DIR="$REALNAME_DIR/"
 export PATH="$TOOLCHAIN_BIN_DIR":$PATH
 export GCC_HONOUR_COPTS
 
-TOOLCHAIN_SYSROOT="$TOOLCHAIN_BIN_DIR/../.."
+TOOLCHAIN_SYSROOT="$TOOLCHAIN_BIN_DIR/.."
 if [ ! -d "$TOOLCHAIN_SYSROOT" ]; then
 	echo "Error: Unable to determine sysroot (looking for $TOOLCHAIN_SYSROOT)!" >&2
 	exit 1