Enable -Werror in Library_odbc again

...had been disabled with 9a84a112 "WaE:
'SQL_API' redefined," but unclear if that is still relevant.

Change-Id: Ia03929879f552123022b6e63a8f892805804ebe4

connectivity/Library_odbc.mk

@@ -10,8 +10,6 @@
 
 $(eval $(call gb_Library_Library,odbc))
 
-$(eval $(call gb_Library_set_warnings_not_errors,odbc))
-
 $(eval $(call gb_Library_set_componentfile,odbc,connectivity/source/drivers/odbc/odbc))
 
 $(eval $(call gb_Library_use_sdk_api,odbc))