Add SDL_revision

Author: Free-Pascal-meets-SDL-Website

units/SDL_revision.inc

@@ -0,0 +1,31 @@
+{
+  This file is part of:
+
+    SDL3 for Pascal
+    (https://github.com/PascalGameDevelopment/SDL3-for-Pascal)
+    SPDX-License-Identifier: Zlib
+}
+
+{
+ * SDL_revision.h contains the SDL revision, which might be defined on the
+ * compiler command line, or generated right into the header itself by the
+ * build system.
+  }
+
+{*
+ * This macro is a string describing the source at a particular point in
+ * development.
+ *
+ * This string is often generated from revision control's state at build time.
+ *
+ * This string can be quite complex and does not follow any standard. For
+ * example, it might be something like "SDL-prerelease-3.1.1-47-gf687e0732".
+ * It might also be user-defined at build time, so it's best to treat it as a
+ * clue in debugging forensics and not something the app will parse in any
+ * way.
+ *
+ * \since This macro is available since SDL 3.0.0.
+  }
+const
+  SDL_REVISION = 'preview-3.1.6-0-g78cc5c173';
+