dev-install: update ebuild.sh path

Portage has started installing this into python-versioned subdirs:
	/usr/lib/portage/python2.7/ebuild.sh

Use a glob to pick up old/new paths.

BUG=chromium:462099
TEST=`cbuildbot amd64-generic-full` passes (includes vmtest/dev-install tests)

Change-Id: I7a0dd31a711097180194bc9c10f13a8bdb53d2eb
Reviewed-on: https://chromium-review.googlesource.com/254530
Trybot-Ready: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/dev-install/dev_install b/dev-install/dev_install
index 422d90c..c2a5f22 100755
--- a/dev-install/dev_install
+++ b/dev-install/dev_install
@@ -154,7 +154,7 @@
   # Add LD_LIBRARY_PATH within ebuild.sh.
   # TODO(arkaitzr): find out a cleaner way to do this.
   sed -i "3 a\export LD_LIBRARY_PATH=\"${LD_LIBRARY_PATH}\"" \
-      /usr/local/lib/portage/bin/ebuild.sh
+      /usr/local/lib/portage/*/ebuild.sh
 
   # Check for package.provided from $BINHOST.
   local package_provided="${BINHOST}/package.provided"