Fix glibc 2.38 compile

glibc 2.38 added strlcpy and strlcat.

src/doomtype.h

@@ -122,6 +122,11 @@ int endswith (const char *base, const char *tag);
 #define HAVE_DOSSTR_FUNCS
 #endif
 
+// glibc 2.38: added strlcpy and strlcat to _DEFAULT_SOURCE
+#if defined (__APPLE__) || __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 38)
+#define HAVE_STRLCPY
+#endif
+
 #ifndef HAVE_DOSSTR_FUNCS
 int strupr(char *n); // from dosstr.c
 int strlwr(char *n); // from dosstr.c
@@ -129,7 +134,7 @@ int strlwr(char *n); // from dosstr.c
 
 #include <stddef.h> // for size_t
 
-#ifndef __APPLE__
+#ifndef HAVE_STRLCPY
 size_t strlcat(char *dst, const char *src, size_t siz);
 size_t strlcpy(char *dst, const char *src, size_t siz);
 #endif

src/string.c

@@ -15,7 +15,7 @@
 #include <string.h>
 #include "doomdef.h"
 
-#if !defined (__APPLE__)
+#ifndef HAVE_STRLCPY
 
 // Like the OpenBSD version, but it doesn't check for src not being a valid
 // C string.