NEW: sysutils/gpp

Hi ports --

Attached is a new port, sysutils/gpp. GPP is a generic preprocessor.

---
pkg/DESCR:
GPP is a general-purpose preprocessor with customizable syntax, suitable
for a wide range of preprocessing tasks. Its independence from any one
programming language makes it much more versatile than the C
preprocessor (cpp), while its syntax is lighter and more flexible than
that of GNU m4. There are built-in macros for use with C/C++, LaTeX,
HTML, XHTML, and Prolog files.
---

Very simple port. Works on amd64 and sparc64. Posting because I need
this for an upcoming port of the cowgol language suite.

OK?

~Brian