Add dependencies/vendor (whatsapp)

vendor/modernc.org/libc/README.md

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+# libc
+
+Package libc provides C-runtime services. Work in progress.
+
+This package is a continuation of the Crt package in modernc.org/crt/v3.
+
+Installation
+
+    $ go get [-u] modernc.org/libc
+
+Documentation: [godoc.org/modernc.org/libc](http://godoc.org/modernc.org/libc)
+
+Building with `make` requires the following Go packages
+
+* github.com/golang/lint/golint
+* github.com/mdempsky/maligned
+* github.com/mdempsky/unconvert
+* honnef.co/go/tools/cmd/unused
+* honnef.co/go/tools/cmd/gosimple
+* github.com/client9/misspell/cmd/misspell