Add clock_settime and clock_nanosleep.

Add the missing prototypes, fix the existing prototypes to use clockid_t
rather than int, fix clock_nanosleep's failure behavior, and add simple
tests.

Bug: 17644443
Bug: https://code.google.com/p/android/issues/detail?id=77372
Change-Id: I03fba369939403918abcabae9551a7123953d780
Signed-off-by: Haruki Hasegawa <h6a.h4i.0@gmail.com>
diff --git a/libc/arch-arm/syscalls/clock_nanosleep.S b/libc/arch-arm/syscalls/__clock_nanosleep.S
similarity index 85%
rename from libc/arch-arm/syscalls/clock_nanosleep.S
rename to libc/arch-arm/syscalls/__clock_nanosleep.S
index 80295bb..ba7ffc4 100644
--- a/libc/arch-arm/syscalls/clock_nanosleep.S
+++ b/libc/arch-arm/syscalls/__clock_nanosleep.S
@@ -2,7 +2,7 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(clock_nanosleep)
+ENTRY(__clock_nanosleep)
     mov     ip, r7
     ldr     r7, =__NR_clock_nanosleep
     swi     #0
@@ -11,4 +11,4 @@
     bxls    lr
     neg     r0, r0
     b       __set_errno_internal
-END(clock_nanosleep)
+END(__clock_nanosleep)