libc: don't export unnecessary symbols

Symbols associated with the internal implementation of memcpy
like routines should be private.

Change-Id: I2b1d1f59006395c29d518c153928437b08f93d16
diff --git a/libc/arch-arm/cortex-a9/bionic/memcpy_base.S b/libc/arch-arm/cortex-a9/bionic/memcpy_base.S
index e8ff4f5..55fd3bd 100644
--- a/libc/arch-arm/cortex-a9/bionic/memcpy_base.S
+++ b/libc/arch-arm/cortex-a9/bionic/memcpy_base.S
@@ -32,7 +32,7 @@
  * cache line.
  */
 
-ENTRY(MEMCPY_BASE)
+ENTRY_PRIVATE(MEMCPY_BASE)
         .cfi_startproc
         .save       {r0, lr}
         .cfi_def_cfa_offset 8
@@ -141,7 +141,7 @@
         .cfi_endproc
 END(MEMCPY_BASE)
 
-ENTRY(MEMCPY_BASE_ALIGNED)
+ENTRY_PRIVATE(MEMCPY_BASE_ALIGNED)
         .cfi_startproc
 
         .save       {r0, lr}