Chance "_WIN64" checks to "_WIN32"

_WIN32 is defined on both 32-bit and 64-bit windows systems, so might as
well just use that.

src/args.cpp

@@ -8,7 +8,7 @@ const char* argp_program_version =
 	"available at <git://git.epicalert.xyz/facecam2d.git> or the\n"
 	"GitLab mirror at <https://gitlab.com/epicalert/facecam2d.git>.";
 
-#ifndef _WIN64
+#ifndef _WIN32
 const struct argp_option options[] = {
 	//name, key, arg, flags, doc, group
 	{"haar-cascade",	0x00,	0,		0,	"Use Haar Cascades for faster (but less accurate) face detection.",	0},
@@ -29,7 +29,7 @@ struct optData optData = {
 	"test",
 };
 
-#ifndef _WIN64
+#ifndef _WIN32
 error_t parseOptions(int key, char* arg, struct argp_state* state) {
 	switch (key) {
 		case 0x00:	//--haar-cascade

src/args.hpp

@@ -3,7 +3,7 @@
 
 #include <string>
 
-#ifndef _WIN64
+#ifndef _WIN32
 #include <argp.h>
 
 error_t parseOptions(int key, char* arg, struct argp_state* state);

src/main.cpp

@@ -9,7 +9,7 @@
 #include <cstring>
 
 int main (int argc, char** argv) {
-#ifndef _WIN64
+#ifndef _WIN32
 	argp_parse(&argp, argc, argv, 0, 0, 0);
 #endif