use less memory on build

http://forum.rejectedsoftware.com/groups/rejectedsoftware.vibed/thread/20659/

frameworks/D/vibed/install.sh

@@ -7,4 +7,4 @@ sudo apt-get install -qq -y libevent-dev libssl-dev
 sudo apt-get install -qq -y g++ gcc-multilib xdg-utils
 wget "http://downloads.dlang.org/releases/2014/dmd_2.066.1-0_amd64.deb"
 sudo dpkg -i dmd_2.066.1-0_amd64.deb
-dub build
+dub build --build-mode=singleFile

frameworks/D/vibed/setup.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 sed -i 's|127.0.0.1|'"${DBHOST}"'|g' source/app.d
 
-dub &
+dub --build-mode=singleFile &