Don't disable exp2 & log2 in LuaJIT (#902)
Don't disable exp2 & log2 in LuaJIT (#902)

That's both C99 & Posix 2001, and dates back to glibc 2.1 on Linux, so
it shouldn't be an issue *anywhere*.
In fact, the only question mark would potentially have been Android,
and it turns out it was building with those enabled without issues
anyway ;).

Dates back to
https://github.com/koreader/koreader-base/commit/2108b6daebb7bcc0ff5c179522d5737e4f9a8ee0
;).
NiLuJe/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,koreader/koreader-base