secmem: Handle HAVE_BROKEN_MLOCK for the case with ASAN.
* src/secmem.c [HAVE_BROKEN_MLOCK] (lock_pool_pages): Take care when build with address sanitizer.
Cherry pick the master commit of:
fe06287003a153d358f2ddb62ce5d1ec112b2e5c
- GnuPG-bug-id: T7889
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>