package/dahdi-linux: fix build with kernel >= 6.8

package/dahdi-linux: fix build with kernel >= 6.8

Fix the following build failure with kernel >= 6.8:

/home/autobuild/autobuild/instance-8/output-1/build/dahdi-linux-3.3.0/drivers/dahdi/xpp/card_global.c: In function ‘parse_chip_command’:
/home/autobuild/autobuild/instance-8/output-1/build/dahdi-linux-3.3.0/drivers/dahdi/xpp/card_global.c:345:9: error: implicit declaration of function ‘strlcpy’; did you mean ‘strscpy’? [-Werror=implicit-function-declaration]
  345 |         strlcpy(buf, cmdline, MAX_PROC_WRITE);  /* Save a copy */
      |         ^~~~~~~
      |         strscpy

Fixes:
 - http://autobuild.buildroot.org/results/a0d2dcd10af9bf465ded2da83eccf2d137187477

Signed-off-by: Fabrice Fontaine <[email protected]>
Signed-off-by: Arnout Vandecappelle <[email protected]>