winedump: Fix compiler warnings with flag -Wcast-qua [try 3]

[Mikhail Maroukhine]

winedump: Fix compiler warnings with flag -Wcast-qual
       - winedump/symbol.c::symbol_get_type - remove constness from the  
parameter because parameter is changed inside of function
       - winedump/search.c:
         - remove not needed variable type_str_tmp
         - remove constness from the type_str because it's changed in the  
symbol_get_type
         - use proto_str as search buffer instead of original proto  
parameter

Mikhail
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