package/vim: use LICENSE file

Use LICENSE file which is available since version 8.2.0105 and
https://github.com/vim/vim/commit/c838626fea42ed5924ee6084d87d1b37b2d7b0ff

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 1f5ed26e1851e752a254d23101b0e97bbe2e5217)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/vim/vim.hash

@@ -1,3 +1,4 @@
 # Locally computed
 sha256  12cce47b81e12779b7d58faf879633be1b668f54a5417a5a24adac50413b3b3c  vim-8.2.3432.tar.gz
+sha256  0bcab3b635dd39208c42b496568d1e8171dad247cf3da5bab3d750c9d5883499  LICENSE
 sha256  96970b67f9cb38b0e759946cff22562a3c4b11ce78f62f2117d5e7ecded9ab4d  README.txt

package/vim/vim.mk

@@ -22,7 +22,7 @@ VIM_CONF_ENV = \
 # GUI/X11 headers leak from the host so forcibly disable them
 VIM_CONF_OPTS = --with-tlib=ncurses --enable-gui=no --without-x
 VIM_LICENSE = Charityware
-VIM_LICENSE_FILES = README.txt
+VIM_LICENSE_FILES = LICENSE README.txt
 VIM_CPE_ID_VENDOR = vim
 
 ifeq ($(BR2_PACKAGE_ACL),y)