New formula: makeheaders

A tiny but powerful utility from the sqlite and fossil folks (it's used by both projects) for more scalable C/C++ codebases (read: cheaper to maintain), in the flavor of source-also-declares-interface--style development, vaguely similar to Go (Golang).  `makeheaders` is the **source** preprocessor that generates headers that makes the magic happen.  Also, it can generate the externally-exported library header too (`-H` instead of `-h`)! 

The github packaging makes it available to everyone that likes versioning / automation, i.e., a package manager and/or configuration management.
If it were worth measuring, here's an non-AST pseudo-count of string literal religions:

```
0 ~/xxxx git:master ❯❯❯ count_yer_quoted_string_religiosity.rb homebrew/
Approximate count of Ruby string literals, by religion:

'-kind 22039  31.3%
"-kind 48301  68.7%

total 70340
0 ~/xxxx git:master ❯❯❯ count_yer_quoted_string_religiosity.rb homebrew/Library/Formula
Approximate count of Ruby string literals, by religion:

'-kind 16810  28.9%
"-kind 41328  71.1%

total 58138
```

I'm sure someone will come along and write a Hadoop script to run a command on every commit of a repo and output pretty graphs and an API.

[script](https://gist.github.com/97fcb4d48dd9edc2534a)
 
(Back to debugging OSX pf.)