Fix iOS build

Broken in crrev.com/c/3206017.
ANGLE roll into Chromium crrev.com/c/3208766 fails on ios-simulator
due to unused function OperatingSystemVersionNumbers.

Bug: chromium:1255114
Change-Id: I2cca5e3cd922733950a51bbc08bf9f41558f8436
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3209207
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
diff --git a/src/tests/test_expectations/GPUTestConfig.cpp b/src/tests/test_expectations/GPUTestConfig.cpp
index e9afafe..c7b2d33 100644
--- a/src/tests/test_expectations/GPUTestConfig.cpp
+++ b/src/tests/test_expectations/GPUTestConfig.cpp
@@ -27,7 +27,7 @@
 namespace
 {
 
-#if defined(ANGLE_PLATFORM_APPLE)
+#if defined(ANGLE_PLATFORM_MACOS)
 // Generic function call to get the OS version information from any platform
 // defined below. This function will also cache the OS version info in static
 // variables.