util/pages: suppress scan-build on page check

util/pages: suppress scan-build on page check

Suppress the following warning:

util-pages.c:49:13: warning: Both PROT_WRITE and PROT_EXEC flags are set. This can lead to exploitable memory regions, which could be overwritten with malicious code [security.MmapWriteExec]
   49 |         if (mprotect(ptr, getpagesize(), PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.

As the check is done to check if the OS allows it or not, for enabling
JIT in pcre.