ENH update build script

build

@@ -2,8 +2,11 @@
 #
 # As of 0.13, xmonad --recompile will look for a custom build script.
 
-set -e
-
-stack build :my-xmonad --verbosity error
-stack install :my-xmonad --local-bin-path bin/ --verbosity error
-mv bin/my-xmonad "$HOME/.local/bin/xmonad"
+exec stack ghc -- \
+  --make xmonad.hs \
+  -i \
+  -ilib \
+  -fforce-recomp \
+  -main-is main \
+  -v0 \
+  -o "$1"