3rdparty: add stb_sprintf

src/3rdparty/stb/repo.json

@@ -0,0 +1,9 @@
+{
+    "home": "https://github.com/nothings/stb/blob/master/stb_sprintf.h",
+    "license": "MIT or Public domain (embed in source)",
+    "version": "v1.10",
+    "author": "nothings",
+    "patches": [
+        "https://github.com/nothings/stb/pull/1695"
+    ]
+}