Allow to disable pcre.jit when system library is used

as it is for now broken on some arch (s390x...)

Author: remicollet

ext/pcre/config0.m4

@@ -47,13 +47,15 @@ PHP_ARG_WITH(pcre-jit,,[  --with-pcre-jit         Enable PCRE JIT functionality
       fi
     fi
 
-    PHP_CHECK_LIBRARY(pcre2-8, pcre2_jit_compile_8,
-    [
-      AC_DEFINE(HAVE_PCRE_JIT_SUPPORT, 1, [ ])
-    ],[
-    ],[
-      $PCRE2_LIB
-    ])
+    if test "$PHP_PCRE_JIT" != "no"; then
+      PHP_CHECK_LIBRARY(pcre2-8, pcre2_jit_compile_8,
+      [
+        AC_DEFINE(HAVE_PCRE_JIT_SUPPORT, 1, [ ])
+      ],[
+      ],[
+        $PCRE2_LIB
+      ])
+    fi
 
     PHP_EVAL_INCLINE($PCRE2_INC)
     PHP_EVAL_LIBLINE($PCRE2_LIB)