bmpfont: fix dependencies.
bmpfont: fix dependencies.

I don't know why bmpfont_create used to depend on the bmpfont_create_gdi and bmpfont_create_gdiplus plugins. bmpfont_create doesn't use them at all. They are loaded dynamically.
On the other hand, bmpfont_create uses the libpng, and every time I made a build from scratch in Visual Studio, I had an error "png.h not found" and I had to re-run the build, and I don't know why it took me so long to fix that. Probably because every time it happened, I was busy working on something else and didn't want to take a break to look at this. Anyway, it should be fixed.

thpatch/thcrap,thpatch/thcrap,thpatch/thcrap,thpatch/thcrap,thpatch/thcrap