Fix sed(1), grep(1) usage (i.e. !GNU).

Index: scripts/xdg-open.in
--- scripts/xdg-open.in.orig
+++ scripts/xdg-open.in
@@ -84,7 +84,7 @@ is_file_url_or_path()
 file_url_to_path()
 {
     local file="$1"
-    if echo "$file" | grep -q '^file://\(localhost\)\?/'; then
+    if echo "$file" | grep -Eq '^file://(localhost)?/'; then
         file=${file#file://localhost}
         file=${file#file://}
         file=${file%%#*}
@@ -354,7 +354,7 @@ DEBUG 3 "$xdg_user_dir:$xdg_system_dirs"
 
 open_generic_xdg_file_mime()
 {
-    filetype=`xdg-mime query filetype "$1" | sed "s/;.*//"`
+    filetype=`xdg-mime query filetype "$1" | sed "s/[ ;].*//"`
     open_generic_xdg_mime "$1" "$filetype"
 }
 
@@ -439,7 +439,7 @@ open_generic()
     if [ x"$BROWSER" = x"" ]; then
         BROWSER=www-browser:links2:elinks:links:lynx:w3m
         if has_display; then
-            BROWSER=x-www-browser:firefox:iceweasel:seamonkey:mozilla:epiphany:konqueror:chromium:chromium-browser:google-chrome:$BROWSER
+            BROWSER=x-www-browser:firefox:chrome:iceweasel:seamonkey:mozilla:epiphany:midori:konqueror:chromium-browser:google-chrome:$BROWSER
         fi
     fi