makearchroot: source /etc/profile before building

This ensures the PATH used when building is the default path and
not the value set by the user calling makechrootpkg.

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

makechrootpkg.in

@@ -264,6 +264,7 @@ echo 'LANG=C' > "$copydir/etc/locale.conf"
 # working copy
 cat >"$copydir/chrootbuild" <<EOF
 #!/bin/bash
+. /etc/profile
 export LANG=C
 export HOME=/build