Help 'file' find its magic file

The 'file' utility is very useful, but unless you had the same setup
as this developer, your 'file' utility would not find its database
of file type fingerprints. Let's change that.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

etc/profile

@@ -68,6 +68,8 @@ export PATH="$HOME/bin:$PATH"
 
 export GNUPGHOME=~/.gnupg
 
+test -n "$MAGIC" || export MAGIC=$(cd / && pwd -W)'/mingw/share/misc/magic'
+
 if [ "x$HISTFILE" == "x/.bash_history" ]; then
   HISTFILE=$HOME/.bash_history
 fi