Updated to v4.4.1 kernel headers.

Small modifications needed to allow compilation with the new headers:

- Manually modify bionic/libc/kernel/uapi/asm-mips/asm/siginfo.h to
  remove the uapi from the include.
- PR_XXX defines are now available for mips, so remove the definition
  from linker_mips.cpp.

Bug: 23789423
Change-Id: I6dc8a03b012426d3a937db15cb24d3a50fab5a8c
diff --git a/libc/kernel/uapi/asm-x86/asm/bitsperlong.h b/libc/kernel/uapi/asm-x86/asm/bitsperlong.h
index 2deae24..0bc255c 100644
--- a/libc/kernel/uapi/asm-x86/asm/bitsperlong.h
+++ b/libc/kernel/uapi/asm-x86/asm/bitsperlong.h
@@ -18,7 +18,7 @@
  ****************************************************************************/
 #ifndef __ASM_X86_BITSPERLONG_H
 #define __ASM_X86_BITSPERLONG_H
-#ifdef __x86_64__
+#if defined(__x86_64__) && !defined(__ILP32__)
 #define __BITS_PER_LONG 64
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #else