Go bindings don't build for Android x86_64 (struct sigaction init) #288

bindings/go/blst.go, line 27, does:
struct sigaction act = { handler }, oact;

On Android 64-bit, Bionic's struct sigaction has int sa_flags as its first field, not the handler. See: https://github.com/aosp-mirror/platform_bionic/blob/731631f300090436d7f5df80d50b6275c8c60a93/libc/include/bits/signal_types.h#L101-L122

Because of that this fails with the NDK's x86_64 clang:

error: incompatible pointer to integer conversion initializing 'int' with an expression of type 'void (int)' [-Wint-conversion]

Using { .sa_handler = handler } should fix this, I think.

This was seen on v0.3.16, building for GOOS=android GOARCH=amd64