uapi headers: simplify the <linux/compiler.h> stuff.
We don't really need <linux/compiler.h> and <linux/compiler_types.h>. We
already have a mechanism to remove unused macros, so let's do that. We
don't currently have a way to remove unused #includes, so we still need
<linux/compiler.h> and <linux/compiler_types.h> files (but I've clarified
the comments in them).
I've kept the empty definitions of `__user` and `__force` for source
compatibility. (We had one security test at least that was assuming
a kernel struct definition will "just work".)
Bug: http://b/262917450
Test: treehugger
Change-Id: Iacbbbc1aeef9a4fac52dabd7811ab875cc267d4f
diff --git a/libc/kernel/uapi/asm-generic/poll.h b/libc/kernel/uapi/asm-generic/poll.h
index 372bc77..ba6f2e9 100644
--- a/libc/kernel/uapi/asm-generic/poll.h
+++ b/libc/kernel/uapi/asm-generic/poll.h
@@ -41,8 +41,8 @@
#ifndef POLLRDHUP
#define POLLRDHUP 0x2000
#endif
-#define POLLFREE (__force __poll_t) 0x4000
-#define POLL_BUSY_LOOP (__force __poll_t) 0x8000
+#define POLLFREE ( __poll_t) 0x4000
+#define POLL_BUSY_LOOP ( __poll_t) 0x8000
struct pollfd {
int fd;
short events;