Only apply linker renaming of strtod() when using 32-bit MinGW.
Only apply linker renaming of strtod() when using 32-bit MinGW.

mingw-w64 doesn't need this, and the 64-bit version doesn't support it.

CastMi/iverilog,CastMi/iverilog,themperek/iverilog,themperek/iverilog,themperek/iverilog,CastMi/iverilog