package/findutils: Fix compile error

package/findutils: Fix compile error

Error occured with an allyespackageconfig setup:

/home/fli4l/br5/output/host/usr/bin/i586-buildroot-linux-uclibc-gcc -std=gnu99  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -Os -g2   -o find ftsfind.o ./libfindtools.a ../lib/libfind.a ../gnulib/lib/libgnulib.a -lintl  -lm -lm
../gnulib/lib/libgnulib.a(getdate.o): In function `get_date':
getdate.c:(.text+0x15cd): undefined reference to `rpl_mktime'
getdate.c:(.text+0x168e): undefined reference to `rpl_mktime'
getdate.c:(.text+0x1707): undefined reference to `rpl_mktime'
getdate.c:(.text+0x1812): undefined reference to `rpl_mktime'
collect2: error: ld returned 1 exit status
make[3]: *** [find] Error 1
make[3]: Leaving directory `/home/fli4l/br5/output/build/findutils-4.4.2/find'

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>