Fix NSIG.

Our sigset_t definition hasn't been tied to our NSIG definition since we
switched to uapi headers, so we can now fix it without breaking the LP32 ABI.
The kernel uapi headers define and use _NSIG, so we need to have our scripts
rename the kernel's definitions out of the way, then we can define _NSIG
and NSIG in terms of the kernel's off-by-one value.

Bug: 12938442
Change-Id: Ic7c86fd5be5ad1d822f7b2b1d88c8a0d70a1ac0f
diff --git a/libc/kernel/uapi/asm-x86/asm/stat.h b/libc/kernel/uapi/asm-x86/asm/stat.h
index 0998106..04c5569 100644
--- a/libc/kernel/uapi/asm-x86/asm/stat.h
+++ b/libc/kernel/uapi/asm-x86/asm/stat.h
@@ -102,7 +102,7 @@
  long __linux_unused[3];
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 };
-#define INIT_STRUCT_STAT_PADDING(st) do {   st.__pad0 = 0;   st.__unused[0] = 0;   st.__unused[1] = 0;   st.__unused[2] = 0;  } while (0)
+#define INIT_STRUCT_STAT_PADDING(st) do {   st.__pad0 = 0;   st.__linux_unused[0] = 0;   st.__linux_unused[1] = 0;   st.__linux_unused[2] = 0;  } while (0)
 #endif
 struct __old_kernel_stat {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */