Fix windows compilation

Author: electricbrass

tests/unit-tests/src/t_stubs.cpp

@@ -127,7 +127,7 @@ void RefreshPalettes (void) {}
 void V_RefreshColormaps() {}
 
 void C_MidPrint (const char *msg, player_t *p, int msgtime) {}
-size_t C_BasePrint(const int printlevel, const char* color_code, const std::string& str) { fmt::print(str); }
+size_t C_BasePrint(const int printlevel, const char* color_code, const std::string& str) { return 0; }
 
 void S_NoiseDebug() {}
 void S_Init(float sfxVolume, float musicVolume) {}