Remove __overloadable/__RENAME_CLANG

Now that we have a clang that supports transparent overloads, we can
kill all of this cruft, and restore our upstream sources to their
untouched glory. Woohoo!

Bug: 12231437
Test: Built aosp_marlin; no obvious patch-related aosp_mips issues.
Change-Id: I520a19d014f12137f80e43f973dccd6711c571cd
diff --git a/libc/arch-mips/string/memchr.c b/libc/arch-mips/string/memchr.c
index 6b4c8cc..bc24f79 100644
--- a/libc/arch-mips/string/memchr.c
+++ b/libc/arch-mips/string/memchr.c
@@ -100,7 +100,7 @@
 }
 
 void *
-memchr (void const *s, int c_in, size_t n) __overloadable
+memchr (void const *s, int c_in, size_t n)
 {
   if (n != 0) {
     const unsigned char *p = (const unsigned char *) s;
diff --git a/libc/arch-mips/string/memcpy.c b/libc/arch-mips/string/memcpy.c
index 68827b6..bb0d179 100644
--- a/libc/arch-mips/string/memcpy.c
+++ b/libc/arch-mips/string/memcpy.c
@@ -286,7 +286,7 @@
 }
 
 void *
-memcpy (void *a, const void *b, size_t len) __overloadable
+memcpy (void *a, const void *b, size_t len)
 {
   unsigned long bytes, words;
   void *ret = a;
diff --git a/libc/arch-mips/string/memmove.c b/libc/arch-mips/string/memmove.c
index fbff297..74d4cd0 100644
--- a/libc/arch-mips/string/memmove.c
+++ b/libc/arch-mips/string/memmove.c
@@ -383,7 +383,7 @@
 }
 
 void *
-memmove (void *dst0, const void *src0, size_t length) __overloadable
+memmove (void *dst0, const void *src0, size_t length)
 {
   unsigned long bytes, words;
   void *ret = dst0;
diff --git a/libc/arch-mips/string/strchr.c b/libc/arch-mips/string/strchr.c
index c9397e7..3458f66 100644
--- a/libc/arch-mips/string/strchr.c
+++ b/libc/arch-mips/string/strchr.c
@@ -92,7 +92,7 @@
   return (char *)p;
 }
 
-char* strchr(const char* s, int c) __overloadable
+char* strchr(const char* s, int c)
 {
   const op_t *w;
   op_t mask_1, mask_128, mask_c;
diff --git a/libc/arch-mips/string/strcpy.c b/libc/arch-mips/string/strcpy.c
index 7b5dee3..b77105e 100644
--- a/libc/arch-mips/string/strcpy.c
+++ b/libc/arch-mips/string/strcpy.c
@@ -167,7 +167,7 @@
 }
 
 char *
-strcpy (char *to, const char *from) __overloadable
+strcpy (char *to, const char *from)
 {
   char *ret = to;
   op_t mask_1, mask_128;
diff --git a/libc/arch-mips/string/strlen.c b/libc/arch-mips/string/strlen.c
index 491efae..28463f6 100644
--- a/libc/arch-mips/string/strlen.c
+++ b/libc/arch-mips/string/strlen.c
@@ -79,7 +79,7 @@
 #endif
 
 size_t
-strlen (const char *str) __overloadable
+strlen (const char *str)
 {
   if (*str) {
     const char *p = (const char *) str;