Fix LIBGIT2_VERSION variable used in Makefile

libgit2 version is referred to as $LIBGIT2_VERSION but the initial
default assignment is set to the variable $LIBGIT2_VER, making
$LIBGIT2_VERSION unset.

Signed-off-by: Sunny <[email protected]>

Author: darkowlzz

Makefile

@@ -28,7 +28,7 @@ SOURCE_VER ?= v0.17.0
 REFLECTOR_VER ?= v0.12.0
 
 # Version of libgit2 the controller should depend on.
-LIBGIT2_VER ?= 1.1.1
+LIBGIT2_VERSION ?= 1.1.1
 
 # Repository root based on Git metadata.
 REPOSITORY_ROOT := $(shell git rev-parse --show-toplevel)