winedump: Fix compiler warnings with flag -Wcast-qual [try 2]

[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

Mikhail
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