BUG: Evidently switch_streams in FlexLexer.h does not have the second argument set to 0 in all distributions.  Setting it explicitly seems to fix the problem.
BUG: Evidently switch_streams in FlexLexer.h does not have the second argument set to 0 in all distributions.  Setting it explicitly seems to fix the problem.

Former-commit-id: a252bf1ee07282f9353c81101ae6cf050fefa661
gtcasl/gpuocelot,3upperm2n/gpuocelot,gtcasl/gpuocelot,3upperm2n/gpuocelot,gtcasl/gpuocelot,3upperm2n/gpuocelot,3upperm2n/gpuocelot,gtcasl/gpuocelot,gtcasl/gpuocelot,gtcasl/gpuocelot,3upperm2n/gpuocelot,3upperm2n/gpuocelot