wdlendian.h: Better host endian detect + Linux.
wdlendian.h: Better host endian detect + Linux.

 + Better compile-time detection of endianness of build target (host) by checking for i386 and x86_64 macros.
 + Enabled Linux support.

tappleby/hush-vst,tappleby/hush-vst,tappleby/hush-vst,tappleby/hush-vst,tappleby/hush-vst