Apple-specific environment variables are derived from the CROSSTOOL instead
of hardcoded in AppleCcToolchain.  Also, apply environment variables to objc
archives.

--
PiperOrigin-RevId: 149439637
MOS_MIGRATED_REVID=149439637

src/main/java/com/google/devtools/build/lib/rules/apple/cpp/AppleCcToolchain.java

diff --git a/src/main/java/com/google/devtools/build/lib/rules/apple/cpp/AppleCcToolchain.java b/src/main/java/com/google/devtools/build/lib/rules/apple/cpp/AppleCcToolchain.java
index 3ce8d66..92902bc 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/apple/cpp/AppleCcToolchain.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/apple/cpp/AppleCcToolchain.java
@@ -63,7 +63,7 @@
 
     Platform platform = appleConfiguration.getSingleArchPlatform();
 
-    Map<String, String> appleEnv = getEnvironment(ruleContext);
+    Map<String, String> appleEnv = getEnvironmentBuildVariables(ruleContext);
 
     return ImmutableMap.<String, String>builder()
         .put(
@@ -114,8 +114,7 @@
         .build();
   }
 
-  @Override
-  public ImmutableMap<String, String> getEnvironment(RuleContext ruleContext) {
+  private ImmutableMap<String, String> getEnvironmentBuildVariables(RuleContext ruleContext) {
     Map<String, String> builder = new LinkedHashMap<>();
     CppConfiguration cppConfiguration = ruleContext.getFragment(CppConfiguration.class);
     AppleConfiguration appleConfiguration = ruleContext.getFragment(AppleConfiguration.class);