#1 undefined reference to `roundf64'

Hi,

while compiling OurPaint, it fails on linking to LaGUI's la_tns_kernel.c; I couldn't find a reference to roundf64 anywhere online, and I only found calls to it in your code - is this an internal thing of yours, or is it maybe some weird GLEW oddity?

I'm on Alpine x86_64, I compiled LaGUI from source w/o errors. Below is a log of how the compilation crashed:

/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/local/lib/lagui/liblagui.a(la_tns_kernel.c.o): in function `tnsDraw2DGrid10':
la_tns_kernel.c:(.text+0x16e6a): undefined reference to `roundf64'
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: la_tns_kernel.c:(.text+0x17004): undefined reference to `roundf64'
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: la_tns_kernel.c:(.text+0x17363): undefined reference to `roundf64'
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: la_tns_kernel.c:(.text+0x174fd): undefined reference to `roundf64'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/OurPaint.dir/build.make:200: OurPaint] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/OurPaint.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

After some look I find roundf64 might not exist in some lighter libraries like musl libc doesn't have that symbol defined. you can modify the roundf64 into just round to compile for now (I will go fix it in a later version). I checked that function, it's no big deal for that part of code.

It links after changing it to round, thanks!

This should be fixed with 0abf6a3437, see if it's okay :D