vk/main: fix game list path check.
vk/main: fix get_home_dir ().
vk/main: use more descriptive error messages.
vk/core: fix warnings
cpu/sh: simplify compile time check.
cpu/sh4: mark a couple of local functions as static.
cpu/sh4: remove spurious braces.
cpu/sh4: fix ldc*rbank and stc*rbank.
cpu/sh4: fix fipr and ftrv.
vk/surface: fix new() prototype.
vk/surface: don't include stdint.h directly.
hikaru/gpu: add missing semicolon.
hikaru/renderer: use a table for RGBA1111 to RGBA4444 conversion.