build: fix syntax-check issues

* cfg.mk: We do want to gettextize the examples.
* po/POTFILES.in: Adjust.

cfg.mk

@@ -156,7 +156,7 @@ exclude = \
 $(call exclude,                                                                 \
   bindtextdomain=^lib/main.c$$                                                  \
   cast_of_argument_to_free=^src/muscle-tab.c$$                                  \
-  po_check=^(examples|tests)/|(^po/POTFILES.in|.md)$$                           \
+  po_check=^tests|(^po/POTFILES.in|.md)$$                                       \
   preprocessor_indentation=^data/|^lib/|^src/parse-gram.[ch]$$                  \
   program_name=^lib/main.c$$                                                    \
   prohibit_always-defined_macros=^data/skeletons/yacc.c$$                       \

po/POTFILES.in

@@ -1,4 +1,5 @@
 examples/c/bistromathic/parse.y
+examples/java/calc/Calc.y
 src/complain.c
 src/conflicts.c
 src/files.c

src/i18n-strings.c

@@ -27,6 +27,9 @@
    strings to gettextize by hand.
   */
 
+// Please syntax-check.
+#include <config.h>
+
 static const char *const msgid[] =
   {
     N_("end of file"),