qa: use time on fuzz targets being run on corpus

.github/workflows/builds.yml

@@ -741,6 +741,7 @@ jobs:
                 exuberant-ctags \
                 unzip \
                 curl \
+                time \
                 wget
       - uses: actions/checkout@v2
       - uses: actions/download-artifact@v2

qa/run-ossfuzz-corpus.sh

@@ -9,5 +9,5 @@ do
     rm -rf corpus_$target
     unzip -q public.zip -d corpus_$target
     #run target on corpus.
-    ./src/$target corpus_$target
+    /usr/bin/time -v ./src/$target corpus_$target
 done