Increase boost download TIMEOUT to 10 minutes, offer a LOG_DOWNLOAD option for capturing download problems.

* Fix FindwxWidgets.cmake for V3.0 wxWidgets using 'win32' style find. i.e. for MinGW native build without msys or cygwin

[MacOSX] Added support in boost context for PPC processors, now is possible again compile kicad testing for PPC ( https://svn.boost.org/trac/boost/ticket/8266 )

Switch to boost::context for all platforms, almost.
Please try your platform by commenting out fcontext.s in common/CMakeLists.txt.

[MacOSX] fixes issues with previous OSX compilers gcc-4.2 and makes a better general beaviour of KICAD_BUILD_STATIC

eeschema: fix compil issue. Boost build: boost lib context built only on OSX (does not build on mingw, and not needed)

(https://svn.boost.org/trac/boost/ticket/8266)

dialog fp lib table display not updated (Windows specific) when an option is changed from the lib table option editor
overloaded function in dialog_fp_lib_table.cpp not compiled with gcc 4.4.7 (try to fix Bug #1262002).
specctra_export.cpp: set min dist to find segment ends when building the board outline to 2 microns (should break anything, but should be enough to fix rounding issues when creating/importing board outlines with arcs)

[MacOSX] Treats LLVM as GCC + adds support for boost multiple processor(ppc/intel) and address(32/64 bit)

build, it throws the time stamps away when there are edits to the CMakeLists.txt portion
pertaining to the external project.  Only a 'make clean' would remove the untarred tree.
This patch removes the need to do a make clean when changing the ExternalProject_Add()
text pertinent to patching.

Fixes bug 1250222 in KiCad-Winbuilder

https://svn.boost.org/trac/boost/ticket/8973
https://svn.boost.org/trac/boost/changeset/84950#file0

This is so builders with multiple out of source build trees can all use
the same common boost install directory.  And the build system will not
vascillate between the fuller and lesser subsets of boost.

* Build OpenSSL from source using the OpenSSL-CMake project on Windows with MinGW when no specifying OPENSSL_ROOT_DIR