Remove local __arm__ ifdef on aes-armv4.pl.

We patch arm-xlate.pl to add the ifdefs, so this isn't needed and
reduces our upstream diff.

(We do still have a diff from upstream here. Will go through them
shortly.)

Change-Id: I5b1e301b9111969815f58d69a98591c973465f42
Reviewed-on: https://boringssl-review.googlesource.com/17105
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

crypto/fipsmodule/aes/asm/aes-armv4.pl

diff --git a/crypto/fipsmodule/aes/asm/aes-armv4.pl b/crypto/fipsmodule/aes/asm/aes-armv4.pl
index 562faab..e8d7f2b 100644
--- a/crypto/fipsmodule/aes/asm/aes-armv4.pl
+++ b/crypto/fipsmodule/aes/asm/aes-armv4.pl
@@ -63,7 +63,6 @@
 $rounds="r12";
 
 $code=<<___;
-#if defined(__arm__)
 #ifndef __KERNEL__
 # include <openssl/arm_arch.h>
 #else
@@ -1225,8 +1224,6 @@
 .size	_armv4_AES_decrypt,.-_armv4_AES_decrypt
 .asciz	"AES for ARMv4, CRYPTOGAMS by <appro\@openssl.org>"
 .align	2
-
-#endif
 ___
 
 $code =~ s/\bbx\s+lr\b/.word\t0xe12fff1e/gm;	# make it possible to compile with -march=armv4