[woff2] Do actual checkout in build.sh. Use dummy repo in Jenkinsfile.

woff2/Jenkinsfile

@@ -19,5 +19,7 @@ def libfuzzerBuild = fileLoader.fromGit('infra/libfuzzer-pipeline.groovy',
                                         'master', null, '')
 
 libfuzzerBuild {
-  git = "https://github.com/google/woff2"
+  // We need to do 'clone --recursive' (to checkout submodules as well).
+  // The below is just a dummy. Actual checkout is being done in build.sh.
+  git = "https://github.com/google/oss-fuzz"
 }

woff2/build.sh

@@ -15,14 +15,14 @@
 #
 ################################################################################
 
-cd /src/woff2
-
-# Checkout and update submodules.
-git submodule init || true
-git submodule update --recursive
+# Checkout woff2 repository with submodules.
+mkdir -p /work/woff2
+cd /work/woff2
+git clone https://github.com/google/woff2 --recursive
 
 # Build the library. Actually there is no 'library' target, so we use .o files.
 # '-no-canonical-prefixes' flag makes clang crazy. Need to avoid it.
+cd woff2
 cat brotli/shared.mk | sed -e "s/-no-canonical-prefixes//" \
 > brotli/shared.mk.temp
 mv brotli/shared.mk.temp brotli/shared.mk