libsoxr: don't use moving target HEAD as source version

Signed-off-by: Steven Barth <steven@midlink.org>

libs/libsoxr/Makefile

@@ -14,7 +14,7 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=git://git.code.sf.net/p/soxr/code
-PKG_SOURCE_VERSION:=HEAD
+PKG_SOURCE_VERSION:=$(PKG_VERSION)
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
 PKG_LICENSE:=LGPL-2.0