bump version to 2.1. remove dependence on git for tarball builds.

cmake/Version.cmake

@@ -1,7 +1,7 @@
 cmake_minimum_required (VERSION 3.4)
 
 set (BARRIER_VERSION_MAJOR 2)
-set (BARRIER_VERSION_MINOR 0)
+set (BARRIER_VERSION_MINOR 1)
 set (BARRIER_VERSION_PATCH 0)
 
 #
@@ -43,6 +43,11 @@ endif()
 if (NOT DEFINED BARRIER_REVISION)
     if (DEFINED ENV{GIT_COMMIT})
         string (SUBSTRING $ENV{GIT_COMMIT} 0 8 BARRIER_REVISION)
+    else()
+        find_program (GIT_BINARY git)
+        if (GIT_BINARY STREQUAL "GIT_BINARY-NOTFOUND")
+            set (BARRIER_REVISION "00000000")
+            message (WARNING "git not found. revision hash set to ${BARRIER_REVISION}")
         else()
             execute_process (
                 COMMAND git rev-parse --short=8 HEAD
@@ -51,6 +56,7 @@ if (NOT DEFINED BARRIER_REVISION)
                 OUTPUT_STRIP_TRAILING_WHITESPACE
             )
         endif()
+    endif()
 endif()
 
 if (DEFINED BARRIER_REVISION)

res/barrier2.desktop

@@ -1,11 +0,0 @@
-[Desktop Entry]
-Type=Application
-Version=1.0
-Name=Barrier
-Comment=Keyboard and mouse sharing solution
-Path=/usr/bin
-Exec=/usr/bin/barrier2
-Icon=barrier
-Terminal=false
-Categories=Utility;
-Keywords=keyboard;mouse;sharing;network;share;