Reconcile BSD and GNU sed

third_party/libvpx/generate_gypi.sh

Index: third_party/libvpx/generate_gypi.sh
diff --git a/third_party/libvpx/generate_gypi.sh b/third_party/libvpx/generate_gypi.sh
index 13086d76bd2af7243e3ab71b79f7ff0afcf15040..811200c670d200f5164868f850a0b1942e8cec85 100755
--- a/third_party/libvpx/generate_gypi.sh
+++ b/third_party/libvpx/generate_gypi.sh
@@ -458,10 +458,11 @@ function update_readme {
   # array entries.
   local vals=($(git --no-pager log -1 --format="%cd%n%H" \
     --date=format:"%A %B %d %Y"))
-  sed -E -i '' \

[jzern, 2016/08/30 23:57:53]

this was my mistake, when testing I think I had the conditions backwards. I had
it correct in an earlier patch, -i'' (no space) should work. Linux reports the
same error with a space between params.

[jzern, 2016/08/31 18:19:09]

I was wrong, abutting it on OSX will consume the next arg '-e' and use that as
the extension

+  sed -E -i.bak \
     -e "s/^(Date:)[[:space:]]+.*$/\1 ${vals[0]}/" \
     -e "s/^(Commit:)[[:space:]]+[a-f0-9]{40}/\1 ${vals[1]}/" \
     ${BASE_DIR}/README.chromium
+  rm ${BASE_DIR}/README.chromium.bak
   cat <<EOF
 
 README.chromium updated with: