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-mips/asm/signal.h b/libc/kernel/uapi/asm-mips/asm/signal.h
index 771e31a..53f5015 100644
--- a/libc/kernel/uapi/asm-mips/asm/signal.h
+++ b/libc/kernel/uapi/asm-mips/asm/signal.h
@@ -19,10 +19,10 @@
 #ifndef _UAPI_ASM_SIGNAL_H
 #define _UAPI_ASM_SIGNAL_H
 #include <linux/types.h>
-#define _NSIG 128
+#define _KERNEL__NSIG 128
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define _NSIG_BPW (sizeof(unsigned long) * 8)
-#define _NSIG_WORDS (_NSIG / _NSIG_BPW)
+#define _NSIG_WORDS (_KERNEL__NSIG / _NSIG_BPW)
 typedef struct {
  unsigned long sig[_NSIG_WORDS];
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
@@ -72,7 +72,7 @@
 #define SIGXFSZ 31
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define SIGRTMIN 32
-#define SIGRTMAX _NSIG
+#define SIGRTMAX _KERNEL__NSIG
 #define SA_ONSTACK 0x08000000
 #define SA_RESETHAND 0x80000000
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */