Allow module names to be hyphenated in the --enable-mods-shared

argument.  Previously, we passed through a user-specified hyphen into
the name of the shell variable, yielding an invalid variable name.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88956 13f79535-47bb-0310-9956-ffa450edef68