QA: severe compiler warnings

[hasufell]

QA Notice: Package triggers severe warnings which indicate that it
may exhibit random runtime failures.
../src/particles.c:974:2: warning: implicit declaration of function ‘luaopen_shaders’ [-Wimplicit-function-declaration]


QA Notice: Package triggers severe warnings which indicate that it
may exhibit random runtime failures.
../src/shaders.c:268:3: warning: array subscript is above array bounds [-Warray-bounds]
../src/shaders.c:269:3: warning: array subscript is above array bounds [-Warray-bounds]

[hasufell]

fixes: https://gist.github.com/hasufell/cb3b10f834e891d90f83

[darkgod]

Woops, fixed thanks