Fix faulty patch name suffix (has to be .patch, not .diff).

debian/changelog

@@ -23,6 +23,7 @@ nx-libs (2:3.5.0.11-0) UNRELEASED; urgency=low
     name change requested in that patch has been rejected for
     NX (redistributed).
   * Apply patches for the Debian package as the last patches in the series.
+  * Fix faulty patch name suffix (has to be .patch, not .diff).
 
   [ Jan Engelhardt ]
   * Update patch: 001_add-main-makefile.full+lite.patch, allow passing of

debian/patches/series

@@ -22,8 +22,8 @@
 021_add-nxauth-wrapper.full.patch
 022_add-nxproxy-wrapper.full+lite.patch
 023_add-x2goagent-wrapper.full.patch
-030_nx-X11_configure-args.full.diff
-031_nx-X11_parallel-make.full.diff
+030_nx-X11_configure-args.full.patch
+031_nx-X11_parallel-make.full.patch
 032_no-x11r6.full.patch
 101_nxagent_set-rgb-path.full.patch
 102_xserver-xext_set-securitypolicy-path.full.patch