package/dnsmasq: fix build with gcc 4.8

Fix the following build failure with gcc 4.8 raised since bump to
version 2.86 in commit 5b29096f8fcb0acd8890073a56ba9d620b1f911c:

pattern.c: In function 'is_valid_dns_name':
pattern.c:134:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for (const char *c = value;; c++)
   ^
pattern.c:134:3: note: use option -std=c99 or -std=gnu99 to compile your code
pattern.c: In function 'is_valid_dns_name_pattern':
pattern.c:249:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for (const char *c = value;; c++)
   ^

Fixes:
 - http://autobuild.buildroot.org/results/eb0c34ff58eaf103f51c7171ecd97a3bdb887601

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dnsmasq/0004-src-pattern.c-fix-build-with-gcc-4.8.patch

@@ -0,0 +1,57 @@
+From 0c89dd2fa0fe50b00bca638dbbacfbd361526e0a Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sun, 2 Jan 2022 21:57:52 +0100
+Subject: [PATCH] src/pattern.c: fix build with gcc 4.8
+
+Fix the following build failure:
+
+pattern.c: In function 'is_valid_dns_name':
+pattern.c:134:3: error: 'for' loop initial declarations are only allowed in C99 mode
+   for (const char *c = value;; c++)
+   ^
+pattern.c:134:3: note: use option -std=c99 or -std=gnu99 to compile your code
+pattern.c: In function 'is_valid_dns_name_pattern':
+pattern.c:249:3: error: 'for' loop initial declarations are only allowed in C99 mode
+   for (const char *c = value;; c++)
+   ^
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Retrieved from:
+https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=b2690415bfa1bc105e61b75f642fb5c1aaf0fae8]
+---
+ src/pattern.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/src/pattern.c b/src/pattern.c
+index 03e23b9..928d259 100644
+--- a/src/pattern.c
++++ b/src/pattern.c
+@@ -129,9 +129,9 @@ int is_valid_dns_name(const char *value)
+   
+   size_t num_bytes = 0;
+   size_t num_labels = 0;
+-  const char *label = NULL;
++  const char *c, *label = NULL;
+   int is_label_numeric = 1;
+-  for (const char *c = value;; c++)
++  for (c = value;; c++)
+     {
+       if (*c &&
+ 	  *c != '-' && *c != '.' &&
+@@ -242,11 +242,11 @@ int is_valid_dns_name_pattern(const char *value)
+   
+   size_t num_bytes = 0;
+   size_t num_labels = 0;
+-  const char *label = NULL;
++  const char *c, *label = NULL;
+   int is_label_numeric = 1;
+   size_t num_wildcards = 0;
+   int previous_label_has_wildcard = 1;
+-  for (const char *c = value;; c++)
++  for (c = value;; c++)
+     {
+       if (*c &&
+ 	  *c != '*' && /* Wildcard. */
+-- 
+2.20.1
+