Update nls.mk for newly added file

Commit f18231e moved some code to a new file, but the new file
wasn't added to nls.mk.

Author: petere

src/interfaces/ecpg/preproc/nls.mk

@@ -1,5 +1,5 @@
 # src/interfaces/ecpg/preproc/nls.mk
 CATALOG_NAME     = ecpg
-GETTEXT_FILES    = descriptor.c ecpg.c pgc.c preproc.c type.c variable.c
+GETTEXT_FILES    = descriptor.c ecpg.c pgc.c preproc.c type.c util.c variable.c
 GETTEXT_TRIGGERS = mmerror:3 mmfatal:2
 GETTEXT_FLAGS    = mmerror:3:c-format mmfatal:2:c-format