linux5.4: enable build on aarch64-musl again

srcpkgs/linux5.4/template

@@ -26,10 +26,6 @@ _kernver="${version}_${revision}"
 triggers="kernel-hooks"
 kernel_hooks_version="${_kernver}"
 
-case "$XBPS_TARGET_MACHINE" in
-	aarch64-musl) broken="fails on builder with fixdep: parse error; no targets found";;
-esac
-
 # These files could be modified when an external module is built.
 mutable_files="
  /usr/lib/modules/${_kernver}/modules.builtin.bin