[Gmsh] [PATCH] Detect OCE when checking for OpenCascade libraries

[D. Barbier]

Hello,

OpenCascade Community Edition (OCE) is a fork of OpenCascade made by
users; the latest version (OCE 0.6.0) is based on OCCT 6.5.1.  We
first focused on improving portability and ease of deployment, and
replaced Autotools by CMake.
Since gmsh build system is also CMake, it is very easy to support it
too.  Here is a patch against CMakeLists.txt, it first looks for
OCEConfig.cmake, and if not found, fallback to the current code to
detect headers and libraries.  The 2nd patch is similar, but I ran
"svn diff -x -b" to display only non-whitespace changes.  This patch
has been tested on Linux against current SVN, but should also work
without trouble on Windows/Mac and other Unix.

Denis
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