Hack to get posix build partially working

Created a dummy build_git_version.h so I did not have to figure out
how to generate it.

Commented out topic_listener.cpp from src/systemcmds/CMakeLists.txt
because it depends on a generated cpp file.

Link doesn't work mut many modules build

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/systemcmds/CMakeLists.txt

@@ -16,7 +16,7 @@ set(directories
 	./motor_test
 	./esc_calib
 	./perf
-	./topic_listener
+#	./topic_listener
 	./dumpfile
 	./pwm
 	)

src/systemcmds/topic_listener/CMakeLists.txt

@@ -30,15 +30,15 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 ############################################################################
-#px4_add_module(
-	#MODULE systemcmds__topic_listener
-	#MAIN listener
-	#STACK 1800
-	#COMPILE_FLAGS
-		#-Os
-	#SRCS
-		#topic_listener.cpp
-	#DEPENDS
-		#platforms__common
-	#)
+px4_add_module(
+	MODULE systemcmds__topic_listener
+	MAIN listener
+	STACK 1800
+	COMPILE_FLAGS
+		-Os
+	SRCS
+		topic_listener.cpp
+	DEPENDS
+		platforms__common
+	)
 # vim: set noet ft=cmake fenc=utf-8 ff=unix :