Fix installation of crosstool-ng libraries to target

When using the crosstool-ng toolchain option, the libc libraries were not
installed to target.  Buildroot calls the show-tuple function to determine
the directory to copy from, and it seems that outputs the result to stderr
instead of stdout

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/toolchain-crosstool-ng/crosstool-ng.mk

@@ -66,7 +66,7 @@ endif
 # Actual copy
 $(STAMP_DIR)/ct-ng-toolchain-installed: $(STAMP_DIR)/ct-ng-toolchain-built
 	$(Q)mkdir -p $(TARGET_DIR)/lib
-	$(Q)CTNG_TUPLE="$$( $(call ctng,show-tuple) )";                     \
+	$(Q)CTNG_TUPLE="$$( $(call ctng,show-tuple 2>&1) )";                \
 	    CTNG_SYSROOT="$(HOST_DIR)/usr/$${CTNG_TUPLE}/sysroot";          \
 	    echo "CTNG_TUPLE='$${CTNG_TUPLE}'";                             \
 	    echo "CTNG_SYSROOT='$${CTNG_SYSROOT}'";                         \