ncurses: Change from using packaged tarballs to git releases

The ncurses tarballs are infrequently released. Start building ncurses
from the git repo to be able to get fixes and improvements quicker.

Signed-off-by: Charlie Jenkins <thecharlesjenkins@gmail.com>

package/libs/ncurses/Makefile

@@ -9,12 +9,15 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ncurses
 PKG_CPE_ID:=cpe:/a:gnu:ncurses
-PKG_VERSION:=6.4
-PKG_RELEASE:=3
+PKG_VERSION_MAJOR:=6.4
+PKG_SNAPSHOT_DATE:=
+PKG_VERSION:=$(PKG_VERSION_MAJOR)$(if $(PKG_SNAPSHOT_DATE),.$(PKG_SNAPSHOT_DATE),)
+PKG_RELEASE:=1
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
-PKG_HASH:=6931283d9ac87c5073f30b6290c4c75f21632bb4fc3603ac8100812bed248159
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL:=https://github.com/ThomasDickey/ncurses-snapshots.git
+PKG_SOURCE_VERSION:=v$(subst .,_,$(PKG_VERSION))
+PKG_MIRROR_HASH:=378a3edb5c060342d7d9dbed28a524cca15cf1661fcc18930e831d5a2b4a0a91
 
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=README