build.sh: Fix tarball name

'meson dist' produces tarball name based on the version in meson.build,
not on the date of run.

For getting the latest version cannot be used much simpler 'git describe
--abbrev=0' (the latest tag), because fork might have less tags or even
no tag.

Fixes: 2e8b3b2 ("build.sh: Add support for meson dist")
Fixes: 6d1f6e0 ("build.sh: Fix testing release build")
Signed-off-by: Petr Vorel <[email protected]>

build.sh

@@ -133,7 +133,8 @@ install()
 dist()
 {
 	local formats="xztar,gztar,zip"
-	local tag="$(date +%Y%m%d)"
+	#local tag="$(git describe --abbrev=0)"
+	local tag="$(grep -w version.: meson.build | sed "s/.*version.:.'\([0-9]\+\)'.*/\1/")"
 	local f
 
 	echo "=== dist ($formats) ==="