merge from dev-win

src/options.c

@@ -209,6 +209,9 @@ static void mi_strlcat(char* dest, const char* src, size_t dest_size) {
 }
 
 #if defined _WIN32
+// On Windows use GetEnvironmentVariable instead of getenv to work
+// reliably even when this is invoked before the C runtime is initialized.
+// i.e. when `_mi_preloading() == true`.
 #include <windows.h>
 static bool mi_getenv(const char* name, char* result, size_t result_size) {
   result[0] = 0;