Hook for Auto-generated Build Version

The automatic versioning system extracts a
build version number from the SCM system

That versioning information is written to the file
_Version.h, a file that is NOT preserved in the SCM.

If such a file will be present,
we include it here to utilize the parameters
that are defined therein.

Marlin/language.h

@@ -36,6 +36,10 @@
   #define LANGUAGE_INCLUDE GENERATE_LANGUAGE_INCLUDE(en)
 #endif
 
+#ifdef HAS_AUTOMATIC_VERSIONING
+  #include "_Version.h"
+#endif
+
 #define PROTOCOL_VERSION "1.0"
 #define FIRMWARE_URL "https://github.com/MarlinFirmware/Marlin"