gnu: akonadi: Shorten file name of patch.

This ensures we stay below the POSIX tar file name length limit.

* gnu/packages/patches/akonadi-Revert-Make-installation-properly-relo.patch:
Rename to...
* gnu/packages/patches/akonadi-not-relocatable.patch: ... this.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/kde-pim.scm (akonadi): Likewise.

gnu/local.mk

@@ -726,7 +726,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/aegisub-boost68.patch                    \
   %D%/packages/patches/agg-am_c_prototype.patch			\
   %D%/packages/patches/akonadi-paths.patch		\
-  %D%/packages/patches/akonadi-Revert-Make-installation-properly-relo.patch \
+  %D%/packages/patches/akonadi-not-relocatable.patch		\
   %D%/packages/patches/akonadi-timestamps.patch		\
   %D%/packages/patches/allegro-mesa-18.2.5-and-later.patch	\
   %D%/packages/patches/amule-crypto-6.patch			\

gnu/packages/kde-pim.scm

@@ -53,7 +53,7 @@
        (patches (search-patches
                  "akonadi-paths.patch"
                  "akonadi-timestamps.patch"
-                 "akonadi-Revert-Make-installation-properly-relo.patch"))))
+                 "akonadi-not-relocatable.patch"))))
     (build-system qt-build-system)
     (native-inputs
      `(("extra-cmake-modules" ,extra-cmake-modules)