ntpd: Fix compile with glibc 2.34

ntpd: Fix compile with glibc 2.34

This adds a patch from Open embedded to fix compilation with glibc 2.34.
This patch was taken from here:
https://github.com/openembedded/meta-openembedded/blob/master/meta-networking/recipes-support/ntp/ntp/0001-libntp-Do-not-use-PTHREAD_STACK_MIN-on-glibc.patch

It fixes the following build problem:
work_thread.c:45:57: error: missing binary operator before token "("
   45 | #if defined(PTHREAD_STACK_MIN) && THREAD_MINSTACKSIZE < PTHREAD_STACK_MIN
      |                                                         ^~~~~~~~~~~~~~~~~
make[7]: *** [Makefile:892: work_thread.o] Error 1

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>