main/zstd: unsplit -static

this is quite annoying for cmake-detecting things, as cmake cannot
handle the case of split files

main/zstd/APKBUILD

@@ -4,7 +4,7 @@
 # Maintainer: psykose <alice@ayaya.dev>
 pkgname=zstd
 pkgver=1.5.2
-pkgrel=6
+pkgrel=7
 pkgdesc="Zstandard - Fast real-time compression algorithm"
 url="https://www.zstd.net/"
 arch="all"
@@ -12,7 +12,6 @@ license="BSD-3-Clause GPL-2.0-or-later"
 makedepends="cmake grep"
 checkdepends="file"
 subpackages="
-	$pkgname-static
 	$pkgname-libs
 	$pkgname-dev
 	$pkgname-doc