version.h: add versioning info from git

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/CMakeLists.txt

@@ -25,6 +25,8 @@ set (maa_LIB_SRCS
   ${PROJECT_SOURCE_DIR}/src/i2c/i2c.c
   ${PROJECT_SOURCE_DIR}/src/i2c/smbus.c
   ${PROJECT_SOURCE_DIR}/src/pwm/pwm.c
+# autogenerated version file
+  ${CMAKE_CURRENT_BINARY_DIR}/version.c
 )
 
 add_library (maa SHARED ${maa_LIB_SRCS})

src/maa.c

@@ -23,9 +23,10 @@
  */
 
 #include "maa.h"
+#include "version.h"
 
-maa_result_t
+const char *
 maa_get_version()
 {
-    return MAA_LIBRARY_VERSION;
+    return gVERSION;
 }