toolchain/helpers.mk: unbreak check_glibc after PROGRAM_INVOCATION removal

As noticed by Thomas Petazzoni on IRC.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/helpers.mk

@@ -147,7 +147,7 @@ check_glibc = \
 	$(call check_glibc_feature,BR2_INET_RPC,RPC support) ;\
 	$(call check_glibc_feature,BR2_ENABLE_LOCALE,Locale support) ;\
 	$(call check_glibc_feature,BR2_USE_MMU,MMU support) ;\
-	$(call check_glibc_feature,BR2_USE_WCHAR,Wide char support) ;\
+	$(call check_glibc_feature,BR2_USE_WCHAR,Wide char support)
 
 #
 # Check the conformity of Buildroot configuration with regard to the