VERSION option in configuration.ccl is overly restrictive in allowed characters

I have a file configuration.ccl like so:

# Configuration definitions for thorn CMake

PROVIDES CMake
{
  SCRIPT src/detect.sh
  LANG bash
  VERSION 3.15.0
  OPTIONS CMAKE_DIR CMAKE_INSTALL_DIR
}

and CST fails with:

CST error in /data/rhaas/postdoc/gr/cactus/CactusAMReX/arrangements/ExternalLibraries/CMake/configuration.ccl (at 7)
  -> SYNTAX ERROR
     HINT: ERROR ON LINE 7:
  SCRIPT src/detect.sh
  LANG bash
  VERSION 3.15.0
           ^
           | here
FOUND CHARACTER: '.'
EXPECTED CHARACTER(S): '-', '0' to '9', 'A' to 'Z', '\', '_', 'a' to 'z', '}'

ie the dot “.” is not allowed in version strings. Since these were modeled (somewhat) after Debian version numbers, here’s an example of one of those 2:3.6.19-1~bpo70+1+b1 and https://manpages.debian.org/buster/dpkg-dev/deb-version.7.en.html for their definition (upstream version could be any string, really).

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