Fix error linking with pthread

Noticed in php 8.3-dev configured with --disable-all

The "-pthread" flag wasn't actually getting used in the makefile.

config.m4

@@ -122,7 +122,7 @@ if test "$PHP_APCU" != "no"; then
           }
         ]])],[ dnl -Success-
           APCU_CFLAGS="-D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1"
-          PHP_ADD_LIBRARY(pthread)
+          PHP_ADD_LIBRARY(pthread,, APCU_SHARED_LIBADD)
           PHP_LDFLAGS="$PHP_LDFLAGS -lpthread"
           AC_DEFINE(APC_NATIVE_RWLOCK, 1, [ ])
           AC_MSG_RESULT([yes])
@@ -131,7 +131,7 @@ if test "$PHP_APCU" != "no"; then
           PHP_APCU_RWLOCKS=no
         ],[
           APCU_CFLAGS="-D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1"
-          PHP_ADD_LIBRARY(pthread)
+          PHP_ADD_LIBRARY(pthread,, APCU_SHARED_LIBADD)
           PHP_LDFLAGS="$PHP_LDFLAGS -lpthread"
     ])
     LIBS="$orig_LIBS"
@@ -173,7 +173,7 @@ if test "$PHP_APCU" != "no"; then
         }
         ]])],[ dnl -Success-
           APCU_CFLAGS="-D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1"
-          PHP_ADD_LIBRARY(pthread)
+          PHP_ADD_LIBRARY(pthread,, APCU_SHARED_LIBADD)
           PHP_LDFLAGS="$PHP_LDFLAGS -lpthread"
           AC_MSG_RESULT([yes])
           AC_DEFINE(APC_HAS_PTHREAD_MUTEX, 1, [ ])
@@ -182,7 +182,7 @@ if test "$PHP_APCU" != "no"; then
           PHP_APCU_MUTEX=no
         ],[
           APCU_CFLAGS="-D_GNU_SOURCE -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1"
-          PHP_ADD_LIBRARY(pthread)
+          PHP_ADD_LIBRARY(pthread,, APCU_SHARED_LIBADD)
           PHP_LDFLAGS="$PHP_LDFLAGS -lpthread"
     ])
     LIBS="$orig_LIBS"