use git describe for release version and fix type in zipball name

sqlipher --> sqlcipher

`git describe` will give only the name of the tag if the current commit
is tagged.  Otherwise, it will get the most recent tag, how many commits
since that tag, and the commit hash id.   This marks non-release builds
clearly and enforces that the release must be made from the proper tagged
git commit.

Author: eighthave

Makefile

@@ -7,10 +7,11 @@ SQLCIPHER_DIR := ${EXTERNAL_DIR}/sqlcipher
 LICENSE := SQLCIPHER_LICENSE
 ASSETS_DIR := assets
 OPENSSL_DIR := ${EXTERNAL_DIR}/openssl
+GIT_DESCRIBE := $(shell git describe)
 LATEST_TAG := $(shell git tag | sort -r | head -1)
 SECOND_LATEST_TAG := $(shell git tag | sort -r | head -2 | tail -1)
-RELEASE_DIR := sqlipher-for-android-${LATEST_TAG}
-CHANGE_LOG_HEADER := "Changes included in the ${LATEST_TAG} release of SQLCipher for Android:"
+RELEASE_DIR := sqlcipher-for-android-${GIT_DESCRIBE}
+CHANGE_LOG_HEADER := "Changes included in the ${GIT_DESCRIBE} release of SQLCipher for Android:"
 README := ${RELEASE_DIR}/README
 
 # Use faketime to freeze time to make for reproducible builds.