Bug 797353 - Add copyright and release info in appdata file

This also means the appdata file now requires preprocessing to set this info
automatically.

cmake/CMakeLists.txt

@@ -9,6 +9,6 @@ endif(APPLE)
 
 
 set_dist_list(cmake_DIST CMakeLists.txt README_CMAKE.txt cmake_uninstall.cmake.in
-    configure-manpage.cmake git2version-info.cmake
+    configure-appdata.cmake configure-manpage.cmake git2version-info.cmake
     version-info2env.cmake
 )

cmake/configure-appdata.cmake

@@ -0,0 +1,16 @@
+# Command to configure the gnucash appdata file
+# These commands are stored in a separate cmake file as they have to be
+# rerun depending on build conditions, not depending on cmake conditions
+# (such as did the version string change or not)
+#
+# The following environment variables are used and should be properly set
+# by the calling code:
+# - SRC_DIR (top level source code directory)
+# - SRC (full path to gnc-vcs-info.h.in)
+# - DST (full path to destination for gnc-vcs-info.h)
+# - VCS_INFO_FILE (full path to gnc-vcs-info.h - can be in source tree (release builds) or build tree (git builds))
+# - DATADIR_BUILD (path to applicication data directory, typically {CMAKE_BINARY_DIR}/share)
+
+include (${SRC_DIR}/cmake/version-info2env.cmake)
+versioninfo2env (${VCS_INFO_FILE})
+configure_file(${SRC} ${DST} )