Accommodate 'pthread-win32' and 'boost/regex' (for libpbd)

libs/pbd/debug_rt_alloc.c

@@ -22,9 +22,10 @@
 #define _GNU_SOURCE
 #include <dlfcn.h>
 #include <stdio.h>
-#include <pthread.h>
 #include <stdlib.h>
 
+#include "pbd/pthread_utils.h"
+
 int (*pbd_alloc_allowed) () = 0;
 
 /** Thread-local key whose value is set to 1 if malloc checking is disabled

libs/pbd/localtime_r.cc

@@ -5,8 +5,8 @@
 #ifndef HAVE_LOCALTIME_R
 #include <time.h>
 #include <string.h>
-#include <pthread.h>
 
+#include "pbd/pthread_utils.h"
 #include "pbd/localtime_r.h"
 
 #ifdef localtime_r

libs/pbd/pathexpand.cc

@@ -23,7 +23,7 @@
 #include <cerrno>
 #include <cstdlib>
 
-#include <regex.h>
+#include <boost/regex.h>
 
 #include <glibmm/miscutils.h>