Fill in undefined math symbols.
Bump version.
Merge pull request #2019 from juj/evenmore_gl_opts

Even more gl opts
Merge pull request #2018 from waywardmonkeys/updates3

Updates3
remove musl use of fwritex
add musl fputws, fix vswprintf, add testing for fwprintf and swprintf as well
Optimize FFP GL shader generation in the case when GL_COMBINE is used. This merges duplicate texture loads into one and avoids a redundant * 1.0 op.