Minor fix to CLI11 to support UWP builds.

Specifically, CommandLineToArgvW is not available for UWP, so replaced it with __argc and __argv directly.

Author: mathgeekcoder

app/CLI11.hpp

@@ -434,6 +434,19 @@ CLI11_INLINE std::vector<std::string> compute_win32_argv();
 namespace detail {
 
 #ifdef _WIN32
+    #ifdef WINAPI_FAMILY
+        #if WINAPI_FAMILY == WINAPI_FAMILY_APP  // window store app
+CLI11_INLINE std::vector<std::string> compute_win32_argv() {
+    std::vector<std::string> result;
+
+    result.reserve(static_cast<size_t>(__argc));
+    for(size_t i = 0; i < static_cast<size_t>(__argc); ++i) {
+        result.push_back(std::string(__argv[i]));
+    }
+
+    return result;
+}
+        #else
 CLI11_INLINE std::vector<std::string> compute_win32_argv() {
     std::vector<std::string> result;
     int argc = 0;
@@ -454,6 +467,8 @@ CLI11_INLINE std::vector<std::string> compute_win32_argv() {
 
     return result;
 }
+        #endif
+    #endif
 #endif
 
 }  // namespace detail