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})