Issue #3585: Add pkg-config support.

It creates a python-2.7.pc file and a python.pc symlink in the
$(LIBDIR)/pkgconfig directory. Patch by Clinton Roy.
diff --git a/Misc/NEWS b/Misc/NEWS
index c2f2121..89160ff 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -971,6 +971,10 @@
 Build
 -----
 
+- Issue #3585: Add pkg-config support. It creates a python-2.7.pc file
+  and a python.pc symlink in the $(LIBDIR)/pkgconfig directory. Patch by
+  Clinton Roy.
+
 - Issue #6094: Build correctly with Subversion 1.7.
 
 - Issue #5847: Remove -n switch on "Edit with IDLE" menu item.