bluelog: fix oui.txt processing

- Use a temporary file path within the package build directory to avoid
   cluttering the host systems `/tmp` directory.

 - Switch to a gzipped, snapshotted copy of the `oui.txt` file since the
   upstream IEEE server is extremely slow, also fetching an unversioned HTTP
   resource during compilation breaks reproducable builds.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
[rework to use standard download facility]
Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

utils/bluelog/patches/100-gen-oui-fix-tempfile-use-mirror.patch

@@ -0,0 +1,31 @@
+--- a/gen_oui.sh
++++ b/gen_oui.sh
+@@ -3,7 +3,7 @@
+ VER="1.2"
+ 
+ # Location of tmp file
+-TMPFILE="/tmp/oui.tmp"
++TMPFILE="./oui.tmp"
+ 
+ # File to write
+ OUIFILE="oui.txt"
+@@ -22,10 +22,7 @@ exit 1
+ 
+ get_oui ()
+ {
+-echo -n "Downloading OUI file from IEEE..."
+-wget --quiet -O $TMPFILE http://standards.ieee.org/develop/regauth/oui/oui.txt || \
+-	ErrorMsg ERR "Unable to contact IEEE server!"
+-
++[ -f "$TMPFILE" ] || ErrorMsg ERR "Unable to find $TMPFILE"
+ echo "OK"
+ }
+ 
+@@ -44,7 +41,6 @@ echo "OK"
+ clean_all ()
+ {
+ echo -n "Removing files..."
+-rm -f $TMPFILE
+ rm -f $OUIFILE
+ echo "OK"
+ }