Remove -std=c89 from compiler command line.

We aren't targeting pure C89 any longer and it also upsets GCC on
AArch64 because asm() isn't part of C89.

Change-Id: I0ba299160e2f0c40d9a99ea8df13b4bb33c08163
Reviewed-on: https://boringssl-review.googlesource.com/2800
Reviewed-by: Adam Langley <agl@google.com>
1 file changed