Revert the unrelated VERSION change in ".gitignore: update"

This partially reverts commit 5d63e48.

Signed-off-by: Brice Goglin <[email protected]>

Author: bgoglin

VERSION

@@ -8,7 +8,7 @@
 # Please update HWLOC_VERSION* in contrib/windows/hwloc_config.h too.
 
 major=2
-minor=2
+minor=1
 release=0
 
 # greek is used for alpha or beta release tags.  If it is non-empty,