skawarePackages: support static builds via pkgsStatic

Most of the skaware packages already build just fine with pkgsStatic,
however the wrapper scripts for execline and stdnotify-wrapper needed
the `-lskarlib` argument to go at the end.

`utmps` and `nsss` still fail with this error:

```
exec ./tools/install.sh -D -m 600 utmps-utmpd /bin/utmps-utmpd
/build/utmps-0.0.3.1/tools/install.sh: line 48: can't create /bin/utmps-utmpd.tmp.479: Permission denied
make: *** [Makefile:121: /bin/utmps-utmpd] Error 1
```

pkgs/os-specific/linux/sdnotify-wrapper/default.nix

@@ -23,13 +23,13 @@ in runCommandCC "sdnotify-wrapper" {
   mkdir -p $bin/bin
   mkdir $out
 
-  # just dynamic for now
+  # the -lskarnet has to come at the end to support static builds
   $CC \
     -o $bin/bin/sdnotify-wrapper \
     -I${skalibs.dev}/include \
     -L${skalibs.lib}/lib \
-    -lskarnet \
-    ${src}
+    ${src} \
+    -lskarnet
 
   mkdir -p $doc/share/doc/sdnotify-wrapper
   # copy the documentation comment