[mythtv] MacOS patches for packaged .app file

[Tomas Edwardsson]

2 Patches both spawned from my efforts to make osx-packager.pl work 
seamlessly with Tiger and Panther.

Changed where MythContextPrivate::MythContextPrivate in 
mythtv/libs/libmyth/mythcontext.cpp searches for the m_installprefix. 
Added an extra check to see if the path to the binary is contained 
within a MythFrontend.app file and if so point m_installprefix 
relatively to "../Resources". Since the .app file can be moved anywhere 
within the system, this seems to work well. (mythtv-mac-appfile.patch)

Changed the configure file for mythplugins. My install prefix is 
"../../build" and all header files and libraries that mythplugins 
depends on are within that path. has_header() and has_library() both 
were not finding my libs/headers. This also removes lots of warnings 
regarding "cat /etc/ld.so.conf" which is not present in MacOS. Basicly 
what I did to find the correct libraries and headers was adding 
$prefix/include and $prefix/lib to the path that is searched. 
(mythtv-configure.patch)

- Tommi
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