debian/control: Remove libpcre3 from build-depends.

We actualy only need the development parts of PCRE3 to build the package.
It also happens that libpcre3-dev depends on the appropriate versioned
libpcre3.

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
debian/copyright: Wrap long lines.

This file should be properly converted to the copyright-format 1.0.

Signed-off-by: Rogério Brito <rbrito@ime.usp.br>