mod_brotli: Explicitly cast 'const uint8_t *' to 'const char *' when using

the data received from Brotli to create a bucket.

This fixes a /W4 warning in my environment, and should also allow building
mod_brotli on NetWare.

Submitted by: NormW <normw gknw.net>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1771791 13f79535-47bb-0310-9956-ffa450edef68