modes/asm/ghash-armv4.pl: extend Apple fix to all clang cases.

Triggered by RT#3989.

(Imported from upstream's fbab8baddef8d3346ae40ff068871e2ddaf10270. This
doesn't seem to affect us, but avoid getting out of sync.)

Change-Id: I164e2a72e4b75e286ceaa03745ed9bcbf6c3e32e
Reviewed-on: https://boringssl-review.googlesource.com/6512
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/modes/asm/ghash-armv4.pl b/crypto/modes/asm/ghash-armv4.pl
index df33be5..d328822 100644
--- a/crypto/modes/asm/ghash-armv4.pl
+++ b/crypto/modes/asm/ghash-armv4.pl
@@ -140,7 +140,7 @@
 .text
 .code	32
 
-#ifdef  __APPLE__
+#ifdef  __clang__
 #define ldrplb  ldrbpl
 #define ldrneb  ldrbne
 #endif