Enforce UTF-8 encoding in bootstrapping

This is breaking our CI system. Also removed the UTF-8 quotes.

--
MOS_MIGRATED_REVID=103534994
diff --git a/scripts/bootstrap/compile.sh b/scripts/bootstrap/compile.sh
index 1dbc287..57c5d29 100755
--- a/scripts/bootstrap/compile.sh
+++ b/scripts/bootstrap/compile.sh
@@ -211,7 +211,7 @@
 
   run_silent "${JAVAC}" -classpath "${classpath}" -sourcepath "${sourcepath}" \
       -d "${output}/classes" -source "$JAVA_VERSION" -target "$JAVA_VERSION" \
-      "@${paramfile}"
+      -encoding UTF-8 "@${paramfile}"
 
   log "Extracting helper classes for $name..."
   for f in ${library_jars} ; do