Zend/zend_call_stack.c: fix build for Linux/uclibc-ng without pthread.

Fix the following build failure without pthread raised since version
8.3.0 and
a11c8a3:

/home/buildroot/instance-0/output-1/build/php-8.3.4/Zend/zend_call_stack.c:39:11: fatal error: pthread.h: No such file or directory
   39 | # include <pthread.h>
      |           ^~~~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/a4ef648a9da50b26ed56d5d490e4cf5a1bfff970

Signed-off-by: Fabrice Fontaine <[email protected]>

Close GH-13843

Author: ffontaine

NEWS

@@ -2,6 +2,10 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 8.3.6
 
+- Core:
+  . Fixed zend_call_stack build with Linux/uclibc-ng without thread support.
+    (Fabrice Fontaine)
+
 - FPM:
   . Fixed bug GH-13563 (Setting bool values via env in FPM config fails).
     (Jakub Zelenka)

Zend/zend_call_stack.c

@@ -35,7 +35,8 @@
 #  include <sys/types.h>
 # endif
 #endif /* ZEND_WIN32 */
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__APPLE__) || defined(__OpenBSD__)
+#if (defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)) || \
+    defined(__FreeBSD__) || defined(__APPLE__) || defined(__OpenBSD__)
 # include <pthread.h>
 #endif
 #ifdef __FreeBSD__