[shotwell] build: Remove some shell magic

[Jens Georg <jensgeorg src gnome org>]

commit 379e37a8c35a670d8d68f65d0500f19465ffb07c
Author: Jens Georg <mail jensge org>
Date:   Fri Apr 15 22:31:05 2016 +0200

    build: Remove some shell magic
    
    git rev-parse HEAD does the same

 Makefile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile b/Makefile
index 1ce5668..914618a 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ PROGRAM_THUMBNAILER = shotwell-video-thumbnailer
 PROGRAM_MIGRATOR = shotwell-settings-migrator
 
 VERSION = 0.22.0
-GITVER := $(shell git log -n 1 2>/dev/null | head -n 1 | awk '{print $$2}')
+GITVER := $(shell git rev-parse HEAD)
 GETTEXT_PACKAGE = $(PROGRAM)
 BUILD_ROOT = 1