linux-user: Fix compilation with DEBUG defined

Signed-off-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/linux-user/flatload.c b/linux-user/flatload.c
index 6a2c3f9..914de1f 100644
--- a/linux-user/flatload.c
+++ b/linux-user/flatload.c
@@ -338,7 +338,7 @@
 static void old_reloc(struct lib_info *libinfo, uint32_t rl)
 {
 #ifdef DEBUG
-	char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
+	const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
 #endif
 	uint32_t *ptr;
         uint32_t offset;