Put separate file reading/writing functions in anonymous namespace

src/SetupModel.cpp

@@ -21,6 +21,8 @@
 void* BinFileBuf;
 BinFile* BF;
 int netbuf[NUM_PLACE_TYPES * 1000000];
+
+namespace {
 constexpr std::uint32_t binary_density_file_magic_number = 0xf0f0f0f0;
 
 void ReadBinaryDensityFile(FILE *dat)
@@ -121,6 +123,7 @@ void WriteBinaryDensityFile(const char *OutDensFile)
 	fwrite_big(BinFileBuf, sizeof(BinFile), (size_t)P.BinFileLen, dat2);
 	fclose(dat2);
 }
+}
 
 ///// INITIALIZE / SET UP FUNCTIONS
 void SetupModel(char* DensityFile, char* NetworkFile, char* SchoolFile, char* RegDemogFile)
@@ -737,6 +740,7 @@ void SetupModel(char* DensityFile, char* NetworkFile, char* SchoolFile, char* Re
 	fprintf(stderr, "Model configuration complete.\n");
 }
 
+namespace {
 void ReadSchoolFile(const char *SchoolFile)
 {
 	int m;
@@ -841,6 +845,7 @@ void ReadRegDemogFile(const char *RegDemogFile)
 	}
 	fclose(dat);
 }
+}
 
 void SetupPopulation(char* SchoolFile, char* RegDemogFile)
 {