r-cran-tmb: prints warning when rmatrix is upgraded

[Graham Inggs <ginggs@debian.org>]

Control: tags -1 + patch

The attached patch upgrades the warning() to a stop().
This will cause r-cran-tmb's autopkgtests to fail whenever rmatrix is upgraded.
Then we will know it is time for a rebuild, or a new upload.

Let me know if this seems a reasonable solution, and I'll do a team upload.

--- a/R/zzz.R
+++ b/R/zzz.R
@@ -15,7 +15,7 @@
     }
     TMB.Matrix.version <- readLines(file)
     if(!identical(TMB.Matrix.version, cur.Matrix.version)) {
-        warning(
+        stop(
             "Package version inconsistency detected.\n",
             "TMB was built with Matrix version ",
             TMB.Matrix.version,