puffin: Add pc files

Adds files libpuffindiff.pc and libpuffpatch.pc.

BUG=chromium:768477
TEST=emerged and make sure pc files are copied.

Change-Id: I2bacfdf847a363c138c601a42fd6c305549bba49
Reviewed-on: https://chromium-review.googlesource.com/683595
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/libpuffpatch.pc b/libpuffpatch.pc
new file mode 100644
index 0000000..2c578a1
--- /dev/null
+++ b/libpuffpatch.pc
@@ -0,0 +1,6 @@
+# This file is for libpuffpatch in Chrome OS.
+
+Name: libpuffpatch
+Description: Puffin library for applying delta patches
+Version: 0.0.1
+Libs: -lpuffpatch
\ No newline at end of file