Apply the fix stated in PCRE bug #1423

There is JIT misoptimization found during code refactoring that
affects PCRE 8.34 (the version currently bundled with Qt).

The upstream might not release a specific bugfix release before 8.35,
hence the patch has been manually applied.

Upstream issue: http://bugs.exim.org/show_bug.cgi?id=1423

Change-Id: I8dbbb2981bc037d39b30fcaded6894ee9820b8df
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

src/3rdparty/pcre/patches/bug_1423_jit_condition_misoptimization_fix.diff

@@ -0,0 +1,15 @@
+Index: pcre_jit_compile.c
+===================================================================
+--- pcre_jit_compile.c	(revision 1413)
++++ pcre_jit_compile.c	(working copy)
+@@ -3546,7 +3546,9 @@
+       }
+     return TRUE;
+     }
+-  if ((ranges[3] - ranges[2]) == (ranges[5] - ranges[4]) && is_powerof2(ranges[4] - ranges[2]))
++  if ((ranges[3] - ranges[2]) == (ranges[5] - ranges[4])
++      && (ranges[2] | (ranges[4] - ranges[2])) == ranges[4]
++      && is_powerof2(ranges[4] - ranges[2]))
+     {
+     if (readch)
+       read_char(common);

src/3rdparty/pcre/pcre_jit_compile.c

@@ -3546,7 +3546,9 @@ switch(ranges[0])
       }
     return TRUE;
     }
-  if ((ranges[3] - ranges[2]) == (ranges[5] - ranges[4]) && is_powerof2(ranges[4] - ranges[2]))
+  if ((ranges[3] - ranges[2]) == (ranges[5] - ranges[4])
+      && (ranges[2] | (ranges[4] - ranges[2])) == ranges[4]
+      && is_powerof2(ranges[4] - ranges[2]))
     {
     if (readch)
       read_char(common);