winedbg: do not write over const char * parameter

[Peter Oberndorfer]

also passes the right string to SymEnumSymbols
and check for _ in symbol name, instead of beginning of string
---
 programs/winedbg/symbol.c |   32 ++++++++++++++++++--------------
 1 files changed, 18 insertions(+), 14 deletions(-)
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