Regression: forbidden-apis 1.5 fails on non-runtime annotations (e.g. java.lang.Synthetic) which are not in classpath

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Simon Willnauer tried to use forbidden 1.5 with ElasticSearch. Sometimes the 
compiler generates "virtual" annotations (java.lang.Synthetic) or annotations 
that are not visible at runtime. Those annotations should not be checked, 
because they might not exist on classpath (e.g. Guava's @NotNull).

This has to be fixed and 1.5.1 needs to be released ASAP.

Original issue reported on code.google.com by uwe.h.schindler on 17 Apr 2014 at 1:02