Provide a static version.h for development builds.

I forgot to add this in last week's versioning revamp, meaning that
dev builds straight from source control would fail for lack of
version.h because Buildscr is the only thing that knows how to create
it. Other projects that I restructured this way come with a static
version of version.h so that local builds can still work; I forgot
that in this one.

[originally from svn r10274]

version.h

@@ -0,0 +1,11 @@
+/*
+ * This header file provides the version #define for a particular
+ * build of Puzzles.
+ *
+ * When my automated build system does a full build, Buildscr
+ * completely overwrites this file with information appropriate to
+ * that build. The information _here_ is default stuff used for local
+ * development runs of 'make'.
+ */
+
+#define VER "Unidentified build"