It's an error if --with-sanitize given but none could be activated

Author: sodabrew

ext/mysql2/extconf.rb

@@ -129,6 +129,7 @@ def asplode(lib)
   enabled_sanitizers = %w(address cfi integer memory thread undefined).select do |s|
     try_link('int main() {return 0;}',  "-Werror -fsanitize=#{s}")
   end
+  abort "-----\nCould not enable any sanitizers!\n-----" if enabled_sanitizers.empty?
 when String
   # Figure out which sanitizers are supported
   enabled_sanitizers, disabled_sanitizers = sanitizers.split(',').partition do |s|