Clean up forking and cloning.

The kernel now maintains the pthread_internal_t::tid field for us,
and __clone was only used in one place so let's inline it so we don't
have to leave such a dangerous function lying around. Also rename
files to match their content and remove some useless #includes.

Change-Id: I24299fb4a940e394de75f864ee36fdabbd9438f9
diff --git a/libc/arch-mips/bionic/clone.S b/libc/arch-mips/bionic/__bionic_clone.S
similarity index 100%
rename from libc/arch-mips/bionic/clone.S
rename to libc/arch-mips/bionic/__bionic_clone.S
diff --git a/libc/arch-mips/mips.mk b/libc/arch-mips/mips.mk
index c895357..1119a66 100644
--- a/libc/arch-mips/mips.mk
+++ b/libc/arch-mips/mips.mk
@@ -1,7 +1,7 @@
 _LIBC_ARCH_COMMON_SRC_FILES := \
+    arch-mips/bionic/__bionic_clone.S \
     arch-mips/bionic/bzero.S \
     arch-mips/bionic/cacheflush.cpp \
-    arch-mips/bionic/clone.S \
     arch-mips/bionic/_exit_with_stack_teardown.S \
     arch-mips/bionic/futex_mips.S \
     arch-mips/bionic/__get_sp.S \
diff --git a/libc/arch-mips/syscalls.mk b/libc/arch-mips/syscalls.mk
index 6b72e70..40932b7 100644
--- a/libc/arch-mips/syscalls.mk
+++ b/libc/arch-mips/syscalls.mk
@@ -1,7 +1,6 @@
 # Generated by gensyscalls.py. Do not edit.
 syscall_src :=
 syscall_src += arch-mips/syscalls/__brk.S
-syscall_src += arch-mips/syscalls/__clone.S
 syscall_src += arch-mips/syscalls/__epoll_pwait.S
 syscall_src += arch-mips/syscalls/__exit.S
 syscall_src += arch-mips/syscalls/__fcntl64.S
diff --git a/libc/arch-mips/syscalls/__clone.S b/libc/arch-mips/syscalls/__clone.S
deleted file mode 100644
index 5ad1489..0000000
--- a/libc/arch-mips/syscalls/__clone.S
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Generated by gensyscalls.py. Do not edit. */
-
-#include <asm/unistd.h>
-    .text
-    .globl __clone
-    .align 4
-    .ent __clone
-
-__clone:
-    .set noreorder
-    .cpload $t9
-    li $v0, __NR_clone
-    syscall
-    bnez $a3, 1f
-    move $a0, $v0
-    j $ra
-    nop
-1:
-    la $t9,__set_errno
-    j $t9
-    nop
-    .set reorder
-    .end __clone