net::ntp: fix build with newer gcc/clang versions

recipes/net/ntp.yaml

@@ -1,4 +1,4 @@
-inherit: [autotools]
+inherit: [autoconf, autotools, patch]
 
 metaEnvironment:
     PKG_VERSION: "4.2.8p18"
@@ -19,8 +19,18 @@ checkoutSCM:
     digestSHA1: 9b5247a8576c6082900682c6de98c8d3c17fc15f
     stripComponents: 1
 
+checkoutDeterministic: True
+checkoutScript: |
+    patchApplySeries $<@ntp/*.patch@>
+
 buildScript: |
-    autotoolsBuild $1 \
+    SRC=$(pwd)/src
+    autoconfSync $1 $SRC
+    pushd $SRC
+    autoconfReconfigure -u
+    popd
+
+    autotoolsBuild $SRC \
         --with-shared \
         --program-transform-name=s,,, \
         --disable-tickadj \

recipes/net/ntp/0003-fix-pthread-detach-check.patch

@@ -0,0 +1,16 @@
+diff -ru a/sntp/m4/openldap-thread-check.m4 b/sntp/m4/openldap-thread-check.m4
+--- a/sntp/m4/openldap-thread-check.m4	2023-05-31 12:31:39.000000000 +0200
++++ b/sntp/m4/openldap-thread-check.m4	2026-02-25 23:18:38.319727258 +0100
+@@ -262,10 +262,8 @@
+ 				dnl save the flags
+ 				AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+ #include <pthread.h>
+-#ifndef NULL
+-#define NULL (void*)0
+-#endif
+-]], [[pthread_detach(NULL);]])],[ol_cv_func_pthread_detach=yes],[ol_cv_func_pthread_detach=no])
++pthread_t thread;
++]], [[pthread_detach(thread);]])],[ol_cv_func_pthread_detach=yes],[ol_cv_func_pthread_detach=no])
+ 			])
+
+ 			if test $ol_cv_func_pthread_detach = no ; then