[sharutils] Compilation with -Werror=format-security fails

Hello,

Fedora tries to compile all packages with GCC -Werror=format-security option,
and sharutils fails with:

gcc -DLOCALEDIR=\"/usr/share/locale\" -DHAVE_CONFIG_H -I. -I..  -I../libopts
-I. -I.. -I../lib -I../lib -I../intl  -Wno-format-contains-nul -O2 -g -pipe
-Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -grecord-gcc-switches  -m64 -mtune=generic
-Werror=format-security -Wno-format-contains-nul -c -o shar.o shar.c
shar.c: In function ‘print_header_stamp’:
shar.c:929:7: error: format not a string literal and no format arguments
[-Werror=format-security]
       error (0, errno, _("Cannot get current directory name"));

This is caused by aoGetsText() in src/shar-opts.h not being marked with
__attribute__ ((format_arg(1))).

-- Petr

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