Upgrading dependency to Thrift 0.12.0

vendor/git.apache.org/thrift.git/lib/ocaml/DEVELOPMENT

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+Thrift OCaml Development
+========================
+
+Prerequisites
+-------------
+
+In order to build this library, you must have the following installed:
+
+  * The OCaml compiler, preferably >4.00
+  * The Oasis build tool
+
+In addition you may want to install OPAM, which will allow you to setup an
+OCaml development environment that's isolated from your system installation,
+much like virutalenv for Python or the myriad systems available for Ruby. If
+you have OPAM installed, then installing Oasis is as simple as running:
+
+  $ opam install oasis
+
+Building
+--------
+
+Once all the prerequisites have been installed, run the following commands:
+
+  $ oasis setup
+  $ ./configure
+  $ make
+
+The `oasis setup` command will generate the configure script and Makefile,
+along with other files that opam will use to create an installable library.
+The cofigure script will ensure that all build dependencies are installed, and
+make will actually build the library.
+
+To remove files that the compiler geneates, run:
+
+  $ make clean
+
+To remove those files _as well as_ files that the setup and configure process
+generates, run:
+
+  $ rm `cat .gitignore`
+
+Installing
+----------
+
+If you're using opam, simply run the following command:
+
+  $ make install
+
+While development, you may want to install your latest build on the system to
+test against other libraries or programs. To do this, use:
+
+  $ make reinstall
+
+Distribution
+------------
+
+The de facto preferred method for distributing OCaml libraries is through the
+OPAM package repository. To publish the latest package, issue a pull request
+against the following github repository:
+
+  https://github.com/ocaml/opam-repository
+
+The pull requestion should add the following directory structure and files:
+
+  package
+    |__thrift
+       |__thrift.<VERSION>
+          |__ descr
+          |__ opam
+          |__ url
+
+Templates for the following files can be found in the opam/ subdirectory of
+this library's root, with XXX(...) indicating fields that need to be filled
+out. You can find further documentation here:
+
+  http://opam.ocaml.org/doc/Packaging.html