Merge pull request #2350 from PX4/master_versioning_fix

Back Port of Git Versioning - without side effects

src/modules/systemlib/git_version.h

@@ -41,6 +41,8 @@
 
 #include <stdint.h>
 
+#include "build_git_version.h"
+
 __BEGIN_DECLS
 
 __EXPORT extern const char* px4_git_version;

src/modules/systemlib/module.mk

@@ -52,8 +52,7 @@ SRCS		 = \
 		   mcu_version.c \
 		   bson/tinybson.c \
 		   circuit_breaker.cpp \
-		   circuit_breaker_params.c \
-		   $(BUILD_DIR)git_version.c
+		   circuit_breaker_params.c
 
 ifeq ($(PX4_TARGET_OS),nuttx)
 SRCS		+= err.c \