Silence -Wformat warnings regarding 'int' vs. 'unsigned int' arguments.
* gettext-tools/src/read-catalog-abstract.c (catalog_reader_parse): Use %u
instead of %d in format string.
* gettext-tools/src/read-properties.c (UTF16_VALUE): Cast result to
'unsigned short'.
* gettext-tools/src/write-java.c (write_lookup_code,
write_java2_init_statements, write_java_code): Use %u instead of %d in format
strings.
* gettext-tools/src/x-perl.c (extract_balanced): Cast enum-typed fprintf
argument to 'int'.
