Stop `--apple_generate_dsym` from applying to host targets

As part of d7d0e972c75a2e83fc5ae19927be38feda006ac9 these flags started
started applying to host targets. This causes unexpected rebuilds of
host tools that you will likely never consume the dSYM from.

Closes #11642.

PiperOrigin-RevId: 319739186
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppOptions.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppOptions.java
index 2a76e39..d7af849 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppOptions.java
@@ -1072,8 +1072,6 @@
     host.disableNoCopts = disableNoCopts;
     host.loadCcRulesFromBzl = loadCcRulesFromBzl;
     host.validateTopLevelHeaderInclusions = validateTopLevelHeaderInclusions;
-    host.appleGenerateDsym = appleGenerateDsym;
-    host.appleEnableAutoDsymDbg = appleEnableAutoDsymDbg;
 
     // Save host options for further use.
     host.hostCoptList = hostCoptList;