Add support for 3.14 kernel

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Changes necessary to support qemu 2.0

share directory needs to be available on slaves (for qemu x86 BIOS)
qemu for sh4 needs -nographic option

Signed- ff-by: Guenter Roeck <linux@roeck-us.net>
README: add powerpc64 and qemu notes

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Various updates

Add unicore32
Drop 3.13 from list of builds
Update powerpc64 compiler version

Signed-off-by: Guenter Roeck <linux@roeck-us.net>