[PROTOC] Exclude ./build directory

There's no reason to try to build anything from
within our temporary build location, and this will
because more heavily used later in the series.
Therefore, let's prepare for this eventuality
by harmlessly excluding it today.

Change-Id: I11d82a738c7ca2942c18ba7169c6ce2309091753
Signed-off-by: Gregory Haskins <gregory.haskins@gmail.com>

scripts/compile_protos.sh

@@ -16,6 +16,7 @@ ROOTLESS_PROTO_FILES="$(find $PWD \
                              $(for dir in $PROTO_ROOT_DIRS ; do echo "-path $dir -prune -o " ; done) \
                              -path $PWD/vendor -prune -o \
                              -path $PWD/gotools -prune -o \
+                             -path $PWD/build -prune -o \
                              -name "*.proto" -exec readlink -f {} \;)"
 ROOTLESS_PROTO_DIRS="$(dirname $ROOTLESS_PROTO_FILES | sort | uniq)"