Fix C99 comment-ism breaking the native AIX compiler. HPUX likely as well.
fix for perf bug detected by Kieran (https://groups.google.com/forum/?fromgroups#!topic/comp.lang.tcl/vfpI3bc-DkQ)
fix for perf bug detected by Kieran (https://groups.google.com/forum/?fromgroups#!topic/comp.lang.tcl/vfpI3bc-DkQ)