[PATCH] shared: include limits.h for PATH_MAX

PATH_MAX is defined in limits.h so include it explicitly.

This fixes the following compile error on musl libc (Alpine Linux):
src/shared/util.c: In function 'util_get_dt':
src/shared/util.c:99:16: error: 'PATH_MAX' undeclared (first use in this function)
  char filename[PATH_MAX];
                ^
---
 src/shared/util.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/shared/util.c b/src/shared/util.c
index 8530440..74ffb08 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c

@@ -32,6 +32,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 #include <dirent.h>
+#include <limits.h>
 
 #include "src/shared/util.h"
 

-- 
2.1.0