Update 64-bit headers/libs

Also
1) rename lib -> lib64
2) add src/ for android-20/arch-arm64 and arch-mips64
3) delete android-9/arch-arm64 and arch-mips64

Change-Id: I4958c4e52946e29e57b910f39ff0104200853a06

ndk/platforms/android-20/include/sys/param.h

@@ -34,16 +34,6 @@
 #define MAXPATHLEN  PATH_MAX
 #define MAXSYMLINKS 8
 
-#if __LP64__
-#define ALIGNBYTES 7
-#else
-#define ALIGNBYTES 3
-#endif
-
-#ifndef ALIGN
-#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) &~ ALIGNBYTES)
-#endif
-
 /* Macros for counting and rounding. */
 #ifndef howmany
 #define howmany(x, y)   (((x)+((y)-1))/(y))