devel/kdesdk3 fail if textproc/flex is installed

[Dima Panov]

Hello!


devel/kdesdk3 fail if textproc/flex is installed, because textproc/flex 
conflicting with system flex, and have ABI incompatibility.

To flex maintiner: ${PREFIX}/include is not good place for confliting header 
file, FlexLexer.h. Move it into subdirectory instead and teach ports, which 
really need this version, to use new version.. 

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Dmitry "Red Fox" Panov @ Home	           FreeBSD since September, 1995
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