[apple] Add a `is_apple` gn variable and use it

As https://crrev.com/c/2299189 adds `OS_MAC` & `OS_APPLE`, add a gn
variable `is_apple` that is true when `OS_APPLE` is defined. This
allow an easy mapping between gn variables and cpp macros.

Convert all usages of `is_ios || is_mac` or `is_mac || is_ios` to
use the new variable instead.

Bug: 1105907
Change-Id: I4cef55496a0ccf0a6162e60409ff3b7996f633dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315695
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#791803}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: fafffe8843d5dac1ef479ae2e9058e0f93faf82d

1 files changed, 1 insertions, 1 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 19718ce..3511cbe 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -358,7 +358,7 @@ static_library("minizip") {
     ]
   }
 
-  if (is_mac || is_ios || is_android || is_nacl) {
+  if (is_apple || is_android || is_nacl) {
     # Mac, Android and the BSDs don't have fopen64, ftello64, or fseeko64. We
     # use fopen, ftell, and fseek instead on these systems.
     defines = [ "USE_FILE32API" ]