build-setup.sh: remove python

Started seeing this with recent fresh builds:

16:24:36 Package python is not available, but is referred to by another package.
16:24:36 This may mean that the package is missing, has been obsoleted, or
16:24:36 is only available from another source
16:24:36 However the following packages replace it:
16:24:36   python2-minimal python2 dh-python 2to3 python-is-python3

Remove python from our build script. This apparently brought in the file
package for free so explicitly include that now.

Tested:
- Verified build-setup.sh can now build the docker image and start a
  bitbake on a system that was not working previously

Change-Id: I00b3398580ada310aa38eed22e7426e059be5e36
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/build-setup.sh b/build-setup.sh
index bc590d4..948279e 100755
--- a/build-setup.sh
+++ b/build-setup.sh
@@ -182,6 +182,7 @@
       chrpath \
       cpio \
       diffstat \
+      file \
       findutils \
       gcc \
       gcc-c++ \
@@ -191,7 +192,6 @@
       perl-bignum \
       perl-Data-Dumper \
       perl-Thread-Queue \
-      python-devel \
       python3-devel \
       SDL-devel \
       socat \
@@ -239,6 +239,7 @@
       cpio \
       debianutils \
       diffstat \
+      file \
       gawk \
       git \
       iputils-ping \
@@ -247,7 +248,6 @@
       libsdl1.2-dev \
       libthread-queue-any-perl \
       locales \
-      python \
       python3 \
       socat \
       subversion \