Platform-specific includes for macOS and non-macOS systems

Removed the unnecessary `PATH_MAX` definition in util.h.

Added conditional inclusion of <bits/pthreadtypes.h> in db.c for
non-macOS systems. Included necessary headers for PATH_MAX and
NAME_MAX in src/log.c, src/postgres.c, and src/util.c when compiling
on macOS to ensure compatibility across different platforms.

Signed-off-by: Charalampos Mitrodimas <charmitro@posteo.net>

include/util.h

@@ -9,8 +9,6 @@
 
 #ifdef _POSIX_C_SOURCE
 #include <limits.h>
-#else
-#define PATH_MAX 4096
 #endif
 
 /* Write/Read end for pipes */

src/db.c

@@ -2,7 +2,9 @@
 #include "db/postgres.h"
 #include "log.h"
 
+#if !defined(__APPLE__) || !defined(__MACH__)
 #include <bits/pthreadtypes.h>
+#endif
 #include <stdlib.h>
 #include <sys/errno.h>
 #include <pthread.h>

src/log.c

@@ -8,6 +8,9 @@
 #include <unistd.h>
 #include <string.h>
 #include <stdlib.h>
+#if defined(__APPLE__) && defined(__MACH__)
+#include <sys/syslimits.h> /* Needed for NAME_MAX, PATH_MAX. */
+#endif
 
 #include "util.h"
 #include "config.h"

src/postgres.c

@@ -3,6 +3,7 @@
 
 #if defined(__APPLE__) && defined(__MACH__)
 #include <mach/error.h>
+#include <sys/syslimits.h> /* Needed for NAME_MAX, PATH_MAX */
 #else
 #include <error.h>
 #endif

src/util.c

@@ -4,6 +4,9 @@
 #include <unistd.h>
 #include <sys/wait.h>
 #include <sys/stat.h>
+#if defined(__APPLE__) && defined(__MACH__)
+#include <sys/syslimits.h> /* Needed for NAME_MAX. */
+#endif
 
 #include "util.h"
 #include "log.h"