libunwind: avoid using $(PKG_NAME) in PKG_SOURCE_URL
If there is used $(PKG_NAME) in PKG_SOURCE_URL,
then it can not be copy&pasted to the browser's address bar.
Let's remove $(PKG_NAME) and use hardcoded project name
in the PKG_SOURCE_URL
Signed-off-by: Josef Schlehofer <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20193
Signed-off-by: Hauke Mehrtens <[email protected]>