sf2dlib issue: Restricting output texture coordinate to two components crashes hardware

[neobrain]

xerpi/sf2dlib@26be2ea (compiled against devkitPro/libctru@b9e5ddb) moved from aemstro shaders to nihstro. However, the shader had to be modified a bit: The aemstro shader used

.out o1, result.texcoord0, 0x3

while the nihstro shader uses

.alias outtex0 o1 as texcoord0 

instead of the direct translation

.alias outtex0 o1.xy as texcoord0

This is because the direct translation caused a crash on real hardware. We're not sure why that is, currently.