libobs/util: Call SymInitialize before other Sym*

On the first call to update the symbol paths, pass the path string to
the SymInitializeW function first if it hasn't been called yet.  If it
has been called, then defer to SymSetSearchPathW and then
SymRefreshModuleList.  This is meant to reduce a needless extra call to
the latter two functions on the first use of the function.

libobs/obs-windows.c

@@ -557,7 +557,6 @@ void reset_win32_symbol_paths(void)
 				!sym_refresh_module_list)
 			return;
 
-		sym_initialize_w(GetCurrentProcess(), NULL, false);
 		initialize_success = true;
 	}
 
@@ -616,8 +615,18 @@ void reset_win32_symbol_paths(void)
 	if (path_str.array) {
 		os_utf8_to_wcs_ptr(path_str.array, path_str.len, &path_str_w);
 		if (path_str_w) {
-			BOOL test = sym_set_search_path_w(GetCurrentProcess(), path_str_w);
-			sym_refresh_module_list(GetCurrentProcess());
+			static bool sym_initialize_called = false;
+
+			if (!sym_initialize_called) {
+				sym_initialize_w(GetCurrentProcess(),
+						path_str_w, true);
+				sym_initialize_called = true;
+			} else {
+				sym_set_search_path_w(GetCurrentProcess(),
+						path_str_w);
+				sym_refresh_module_list(GetCurrentProcess());
+			}
+
 			bfree(path_str_w);
 		}
 	}