musl: use official release tar

To prevent "wrong" musl packages which have a new version number
but the package still contains an old version, because
PKG_SOURCE_VERSION was unchanged.

Ref: musl ml https://www.openwall.com/lists/musl/2020/05/22/4

Reviewed-by: Petr Štetiar <ynezz@true.cz>
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

toolchain/musl/common.mk

@@ -11,12 +11,9 @@ PKG_NAME:=musl
 PKG_VERSION:=1.1.24
 PKG_RELEASE:=1
 
-PKG_SOURCE_PROTO:=git
-PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=ea9525c8bcf6170df59364c4bcd616de1acf8703
-PKG_MIRROR_HASH:=6975c45b9bfe586ac00dbfcd1b1a13ab110af0528028ab3dee03e23e2c0763e5
-PKG_SOURCE_URL:=https://git.musl-libc.org/git/musl
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.xz
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://musl.libc.org/releases/
+PKG_HASH:=1370c9a812b2cf2a7d92802510cca0058cc37e66a7bedd70051f0a34015022a3
 
 LIBC_SO_VERSION:=$(PKG_VERSION)
 PATCH_DIR:=$(PATH_PREFIX)/patches