Remove (non-working) workaround for Ubuntu 12.04

Author: k-takata

Makefile

@@ -14,7 +14,7 @@ html:
 	cp -R syntax target/html
 	cp doc/*.jax vim_faq/*.jax target/html/doc
 	cp tools/buildhtml.vim tools/makehtml.vim target/html
-	-cd target/html/doc ; vim -c "set rtp^=../../../tools" -eu ../buildhtml.vim -c "qall!"
+	-cd target/html/doc ; vim -eu ../buildhtml.vim -c "qall!"
 
 clean:
 	rm -rf target