darcs patch: add extra-includes field to buildinfo

[Bertram Felgenhauer]

Hi,

please consider the attached patch. It allows installing include files
into $(lib)/include without automatically including them in compilations
via C. Use cases can be found in the package description below. The
base package could take advantage of this feature immediately.

The patch is possibly incomplete: the field is completely ignored
when installing packages for Hugs, which is bad if the header files
are indeed used for Haskell code in a different package.

Bertram

Thu Apr 19 12:42:24 CEST 2007  Bertram Felgenhauer <int-e at gmx.de>
  * add extra-includes field to buildinfo
  The patch targets packages that come with an include file which includes
  other include files in turn, or packages that want to install header files
  that are used for preprocessing Haskell code rather than C code.
  This will allow the base package to install its header files properly.

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