newlib: mips: delete glibc-specific logic

This code looks like it's written to be copied & pasted between diff
C libraries and relies on _LIBC only being used with glibc.  This will
break when newlib changes from _COMPILING_NEWLIB to _LIBC, so delete
the glibc-specific logic ahead of time.

newlib/libc/machine/mips/memcpy.S

@@ -33,12 +33,6 @@
 # define USE_MEMMOVE_FOR_OVERLAP
 # define PREFETCH_LOAD_HINT PREFETCH_HINT_LOAD_STREAMED
 # define PREFETCH_STORE_HINT PREFETCH_HINT_PREPAREFORSTORE
-#elif _LIBC
-# include <sysdep.h>
-# include <regdef.h>
-# include <sys/asm.h>
-# define PREFETCH_LOAD_HINT PREFETCH_HINT_LOAD_STREAMED
-# define PREFETCH_STORE_HINT PREFETCH_HINT_PREPAREFORSTORE
 #elif _COMPILING_NEWLIB
 # include "machine/asm.h"
 # include "machine/regdef.h"
@@ -877,8 +871,3 @@ L(r6_unaligned7):
 	.set	at
 	.set	reorder
 END(MEMCPY_NAME)
-#ifndef ANDROID_CHANGES
-# ifdef _LIBC
-libc_hidden_builtin_def (MEMCPY_NAME)
-# endif
-#endif

newlib/libc/machine/mips/memset.S

@@ -31,11 +31,6 @@
 # include "machine/asm.h"
 # include "machine/regdef.h"
 # define PREFETCH_STORE_HINT PREFETCH_HINT_PREPAREFORSTORE
-#elif _LIBC
-# include <sysdep.h>
-# include <regdef.h>
-# include <sys/asm.h>
-# define PREFETCH_STORE_HINT PREFETCH_HINT_PREPAREFORSTORE
 #elif _COMPILING_NEWLIB
 # include "machine/asm.h"
 # include "machine/regdef.h"
@@ -430,8 +425,3 @@ L(leave):
 	.set	at
 	.set	reorder
 END(MEMSET_NAME)
-#ifndef ANDROID_CHANGES
-# ifdef _LIBC
-libc_hidden_builtin_def (MEMSET_NAME)
-# endif
-#endif

newlib/libc/machine/mips/strcmp.S

@@ -30,10 +30,6 @@
 #ifdef ANDROID_CHANGES
 # include "machine/asm.h"
 # include "machine/regdef.h"
-#elif _LIBC
-# include <sysdep.h>
-# include <regdef.h>
-# include <sys/asm.h>
 #elif _COMPILING_NEWLIB
 # include "machine/asm.h"
 # include "machine/regdef.h"
@@ -254,8 +250,3 @@ L(bexit89):
 	.set	reorder
 
 END(STRCMP_NAME)
-#ifndef ANDROID_CHANGES
-# ifdef _LIBC
-libc_hidden_builtin_def (STRCMP_NAME)
-# endif
-#endif