Add the 'patchcheck' build target to .PHONY.

Re-closes issue 3758. Thanks to Ralph Corderoy for the catch.
diff --git a/Misc/NEWS b/Misc/NEWS
index ed3c3d0..c32bd68 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,11 @@
 - Issue #4014: Don't claim that Python has an Alpha release status, in addition
   to claiming it is Mature.
 
+Build
+-----
+
+- Issue #3758: Add ``patchcheck`` build target to .PHONY.
+
 
 What's New in Python 2.6 final
 ==============================