Apply a workaround for Bionic's ioctl signedness hack

Sqlite takes ioctl's address, and immediately casts it to a type
incompatible with either `int(*)(int, int, ...)` or `int(*)(int,
unsigned, ...)`. So, clang doesn't know what overload to pick, even
though they both ultimately point to the same function.

Bug: https://github.com/android-ndk/ndk/issues/402
Test: m on internal master
Change-Id: I67aa885c835a3703d3ed23b5c3f24d3387c51be2