Ensure x86_64 perlasm output ends with a newline.

Appease the Mac build.

Change-Id: I8b93906d8c7059fd63da9622fd530cc82bd05f7c
Reviewed-on: https://boringssl-review.googlesource.com/1760
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/perlasm/x86_64-xlate.pl b/crypto/perlasm/x86_64-xlate.pl
index 8018fbd..7c80dc2 100755
--- a/crypto/perlasm/x86_64-xlate.pl
+++ b/crypto/perlasm/x86_64-xlate.pl
@@ -936,7 +936,7 @@
 
 print "\n$current_segment\tENDS\n"	if ($current_segment && $masm);
 print "END\n"				if ($masm);
-print "#endif"				if ($gas);
+print "#endif\n"			if ($gas);
 
 
 close STDOUT;