package/micropython: drop GIT_DIR=. workaround

Now that it is handled globally in TARGET_MAKE_ENV.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 9024e18665232dc4047203edb6d012021baeedfa)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/micropython/micropython.mk

@@ -14,11 +14,6 @@ MICROPYTHON_LICENSE = MIT, BSD-1-Clause, BSD-3-Clause, Zlib
 MICROPYTHON_LICENSE_FILES = LICENSE
 MICROPYTHON_DEPENDENCIES = host-pkgconf libffi host-python3
 
-# Set GIT_DIR so package won't use buildroot's version number
-MICROPYTHON_MAKE_ENV = \
-	$(TARGET_MAKE_ENV) \
-	GIT_DIR=.
-
 # Use fallback implementation for exception handling on architectures that don't
 # have explicit support.
 ifeq ($(BR2_i386)$(BR2_x86_64)$(BR2_arm)$(BR2_armeb),)