[gdb/build] Fix YYSTYPE and yyalloc odr violation

When building gdb with -O2 -flto I run into:
...
ada-exp.c.tmp:576:7: error: type ‘union YYSTYPE’ violates the C++ One \
  Definition Rule [-Werror=odr]
...

Fix this by renaming to ada_exp_YYSTYPE and likewise for other .y files.

Likewise for yyalloc.

Tested on x86_64-linux.  Also tested with byacc rather than bison on
suggestion of Tom Tromey.

Approved-By: Tom Tromey <[email protected]>

PR build/22395
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=22395

Author: vries

gdb/Makefile.in

@@ -2509,6 +2509,8 @@ po/$(PACKAGE).pot: force
 	     -e 's/\([ \t;,(]\)free$$/\1xfree/g' \
 	     -e '/^#line.*y.tab.c/d' \
 	     -e 's/YY_NULL/YY_NULLPTR/g' \
+	     -e "s/YYSTYPE/$(subst -,_,$*)_YYSTYPE/g" \
+	     -e "s/yyalloc/$(subst -,_,$*)_yyalloc/g" \
 	  < $@.tmp > $@.new && \
 	  rm -f $@.tmp && \
 	  mv $@.new $@