disable color output

Index: install-mono-prefix.sh
--- install-mono-prefix.sh.orig
+++ install-mono-prefix.sh
@@ -16,4 +16,4 @@ fi
 
 MONO_PREFIX=$1
 
-msbuild mono/build/install.proj /p:MonoInstallPrefix=$MONO_PREFIX /p:Configuration=$CONFIG
+msbuild mono/build/install.proj /clp:DisableConsoleColor /p:DESTDIR=$DESTDIR /p:MonoInstallPrefix=$MONO_PREFIX /p:Configuration=$CONFIG