- AS_VAR_IF, AS_VAR_APPEND used and CS synced
- Added one missing AC_MSG_RESULT to properly put the configure output
log on each line
- AH_TEMPLATE used for HAVE_USERFAULTFD_WRITEFAULT to have help text on
lesser places
- Redundant terminating semicolons removed
- Redundant PTHREADS_CHECK call removed as it is already done in
configure.ac and before including SAPI M4 stubs
- Redundant CFLAGS and LIBS storing and restoring removed