Mac: add str_replace.h to fix build breaks.

clientscr/mac_saver_module.cpp

@@ -49,6 +49,7 @@ extern "C" {
 #include "Mac_Saver_Module.h"
 #include "screensaver.h"
 #include "diagnostics.h"
+#include "str_replace.h"
 
 //#include <drivers/event_status_driver.h>
 

mac_installer/Installer.cpp

@@ -31,6 +31,7 @@
 #include <sys/stat.h>
 
 #include "str_util.h"
+#include "str_replace.h"
 
 #define boinc_master_user_name "boinc_master"
 #define boinc_master_group_name "boinc_master"

mac_installer/WaitPermissions.cpp

@@ -25,6 +25,7 @@
 #include <unistd.h>	// getuid
 #include <dirent.h>
 #include "str_util.h"
+#include "str_replace.h"
 
 void print_to_log_file(const char *format, ...);
 void strip_cr(char *buf);