eliminate all warnings in non-thirdparty code on mac

Most of these issues were due to functions whose definitions appear in header files; I changed those functions to be 'static inline' instead of just 'static' or 'inline', which kills the warning for such functions.

Other functions that were static or anonymous-namespaced but were unused in cpp files were probably called at some point but are no longer; someone who knows more than I do should probably scrub all the functions I either deleted or #if 0'ed out and make sure that the right thing is happening here.

Lots of unused variables removed, and one nasty const issue handled.

There remains a single warning in thirdparty/externals/cityhash/src/city.cc on line 146 related to a signed/unsigned mismatch.  I don't know if we have control over this library so I didn't fix this one, but perhaps someone could do something about that one.

BUG=

Review URL: https://codereview.appspot.com/7067044

git-svn-id: http://skia.googlecode.com/svn/trunk@7051 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/TLSTest.cpp b/tests/TLSTest.cpp
index 17f7dcb..38eb322 100644
--- a/tests/TLSTest.cpp
+++ b/tests/TLSTest.cpp
@@ -71,7 +71,7 @@
     // TODO: Disabled for now to work around
     // http://code.google.com/p/skia/issues/detail?id=619
     // ('flaky segfault in TLS test on Shuttle_Ubuntu12 buildbots')
-    //test_threads(&thread_main);
+    if( false ) test_threads(&thread_main);
 
     // Test to ensure that at thread destruction, TLS destructors
     // have been called.