I was able to get a working patch from Arch.
I went here
and downloaded their tar file from here
. The gzip file will contain the linux-recent.patch file. Copy that into your SBo source directory where you are going to build the broadcom-wl driver.
Modify the SlackBuild to include the patch like this:
patch -p1 < $CWD/linux-recent.patch
Comment out any other previous patch. I'm using the SBo from the SlackBuilds website. Module loaded fine and all wireless connections now show up.
I will mark this thread a SOLVED! Thank you frankbell for your help.