uClibc-ng: hotfix for gettid() declaration

toolchain/uclibc-ng/patches/0001-fix-gettid-declaration.patch

@@ -0,0 +1,25 @@
+From 0dfba20346541d0a9261f1d5c81f9d4ba5122b26 Mon Sep 17 00:00:00 2001
+From: Waldemar Brodkorb <wbx@openadk.org>
+Date: Sun, 25 Jan 2026 18:50:49 +0100
+Subject: [PATCH] fix gettid declaration
+
+---
+ include/unistd.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/include/unistd.h b/include/unistd.h
+index 0fd430549..bfb6ecc13 100644
+--- a/include/unistd.h
++++ b/include/unistd.h
+@@ -1260,7 +1260,7 @@ extern int getentropy(void *__buf, size_t __len) __nonnull ((1)) __wur;
+ #endif
+ 
+ #if (defined _GNU_SOURCE && defined __UCLIBC_HAS_THREADS_NATIVE__)
+-pid_t gettid(void);
++extern __pid_t gettid(void);
+ #endif
+ 
+ __END_DECLS
+-- 
+2.47.3
+