Remove redundant declaration of OPENSSL_ia32cap_P from e_aes.c.

Some compilers warn about this duplicate declaration in some
configurations.

Change-Id: I3ff038a5feb0b2632b140e6632ea48acb0dcc118
Reviewed-on: https://boringssl-review.googlesource.com/5551
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/cipher/e_aes.c b/crypto/cipher/e_aes.c
index 99e090d..24013dc 100644
--- a/crypto/cipher/e_aes.c
+++ b/crypto/cipher/e_aes.c
@@ -98,8 +98,6 @@
 #if !defined(OPENSSL_NO_ASM) && \
     (defined(OPENSSL_X86_64) || defined(OPENSSL_X86))
 #define VPAES
-extern unsigned int OPENSSL_ia32cap_P[];
-
 static char vpaes_capable(void) {
   return (OPENSSL_ia32cap_P[1] & (1 << (41 - 32))) != 0;
 }