glibc-2.15 32-bit sigcontext.h pulls in asm/sigcontext.h. Because turbostat
is using -I to point to the kernel source UAPI dir, we get an error about
linux/compiler.h not being found. That's true, because the kernel doesn't
export linux/compiler.h and it's stripped out of the uapi sigcontext.h file
when we export it. But that doesn't help us when turbostat is being stupid
and pointing at the pre-stripped UAPI headers. Just what.
So just point it to the top level kernel include directory after it's already
searched everything else.
