CI updates

misc/cmake/use_strict_defaults.cmake

@@ -0,0 +1,11 @@
+#
+# UPX "CMake" build file; see https://cmake.org/
+# Copyright (C) Markus Franz Xaver Johannes Oberhumer
+#
+
+if(NOT DEFINED USE_STRICT_DEFAULTS)
+    # strict config defaults for Git developer builds
+    set(USE_STRICT_DEFAULTS TRUE CACHE INTERNAL "" FORCE)
+endif()
+
+# vim:set ft=cmake ts=4 sw=4 tw=0 et: