Remove two unused `extern`s on function declarations.
These were the only two in our headers.
Change-Id: Iaa3dd5ff8e95130d6fea39c68518f72d634aaa5c
diff --git a/libc/include/bits/fortify/string.h b/libc/include/bits/fortify/string.h
index 7df0b05..4d32b04 100644
--- a/libc/include/bits/fortify/string.h
+++ b/libc/include/bits/fortify/string.h
@@ -38,7 +38,7 @@
size_t __strlcat_chk(char* _Nonnull, const char* _Nonnull, size_t, size_t);
#if defined(__BIONIC_FORTIFY)
-extern void* _Nullable __memrchr_real(const void* _Nonnull, int, size_t) __RENAME(memrchr);
+void* _Nullable __memrchr_real(const void* _Nonnull, int, size_t) __RENAME(memrchr);
#if __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
/* No diag -- clang diagnoses misuses of this on its own. */