[PATCH] unit: pragma test_address to fix GCC warning on musl-libc

This appears to be a compiler bug causing an array-bounds warning:

unit/test-rtnl.c: In function 'test_address':
unit/test-rtnl.c:285:13: error: offset '2305843009213693948' outside bounds of constant string [-Werror=array-bounds]
  285 | static void test_address(const void *data)
      |             ^~~~~~~~~~~~
unit/test-rtnl.c:215:36: note: 'address' declared here
  215 | static const struct l_rtnl_address address = {
      |                                    ^~~~~~~

There is nothing visually wrong with the code, and it appears to be
having an issue with the "label" member, which is a simple constant
string. Doing things like adding a member before "label" or making
"address" not const seems to make it go away, making it really
appear as if the compiler is confused.

Fix this by adding a pragma for that test function.
---
 unit/test-rtnl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/unit/test-rtnl.c b/unit/test-rtnl.c
index 25e1859..59d8492 100644
--- a/unit/test-rtnl.c
+++ b/unit/test-rtnl.c
@@ -279,6 +279,8 @@ static struct ifaddrmsg *build_ifaddrmsg(const struct l_rtnl_address *addr,
 	return ifamsg;
 }
 
+_Pragma("GCC diagnostic push")
+_Pragma("GCC diagnostic ignored \"-Warray-bounds\"")
 static void test_address(const void *data)
 {
 	static const int ifindex = 3;
@@ -293,6 +295,7 @@ static void test_address(const void *data)
 	assert(messages_equal(nlm, ifamsg, ifamsg_len));
 	l_netlink_message_unref(nlm);
 }
+_Pragma("GCC diagnostic pop")
 
 static void signal_handler(uint32_t signo, void *user_data)
 {
-- 
2.34.1