versioner: Fix bzero/bcopy fortify

This commit replaces `bzero` with `__bionic_bzero` and `bcopy` with
`__bionic_bcopy` because `bzero` and `bcopy` are partially defined in
`libc.map.txt`.  Bionic versioner raises errors because versioner treats
static inline functions as exported function definitions then it
compares the availability with the information specified in
`libc.map.txt`.

This commit fixes the problem by replacing static inline functions into
`__bionic_{bzero,bcopy}` and defining aliases for source-level
compatibility.

Test: PATH=$(pwd)/prebuilts/clang-tools/linux-x86/bin:$PATH \
      bionic/tools/versioner/run_tests.py
Bug: 140110040

Change-Id: I97f2f0dc0abccd0a9fcfe5bb02f4e918362d35cc
diff --git a/libc/include/bits/fortify/strings.h b/libc/include/bits/fortify/strings.h
index 6bda295..385cf77 100644
--- a/libc/include/bits/fortify/strings.h
+++ b/libc/include/bits/fortify/strings.h
@@ -30,7 +30,7 @@
 
 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__
 __BIONIC_FORTIFY_INLINE
-void bcopy(const void *src, void* const dst __pass_object_size0, size_t len)
+void __bionic_bcopy(const void *src, void* const dst __pass_object_size0, size_t len)
         __overloadable
         __clang_error_if(__bos_unevaluated_lt(__bos0(dst), len),
                          "'bcopy' called with size bigger than buffer") {
@@ -43,7 +43,7 @@
 }
 
 __BIONIC_FORTIFY_INLINE
-void bzero(void* const b __pass_object_size0, size_t len)
+void __bionic_bzero(void* const b __pass_object_size0, size_t len)
         __overloadable
         __clang_error_if(__bos_unevaluated_lt(__bos0(b), len),
                          "'bzero' called with size bigger than buffer") {