Latest changes in langinfo break libunistring build

[Tim Ruehsen]

Hi,

reported by oss-fuzz and reproducible locally when building
libunistring (latest master):


gcc -DHAVE_CONFIG_H -DNO_XMALLOC -I. -I..  -I. -I. -I.. -I..
-DIN_LIBUNISTRING -DDEPENDS_ON_LIBICONV=1   -g -Og -Wall -Wextra -c
localcharset.c
In file included from localcharset.c:59:0:
./langinfo.h:163:7: error: token "@" is not valid in preprocessor
expressions
 # if address@hidden@
       ^
Makefile:5886: die Regel für Ziel „config.h“ scheiterte
make[2]: *** [config.h] Fehler 1
make[2]: Verzeichnis „/home/tim/src/libunistring/lib“ wird verlassen


Regards, Tim