Change original bdiff C code link

Changed from phost.de/~stefan to Google Drive.

Did this because the original link was http: and some browsers were
blocking the download.

Author: delphidabbler

_software/bdiff.html

@@ -32,7 +32,7 @@ <h2 class="panel-title">
       For details of how to use the programs read the manual pages &ndash; the are links in the <a href="#docs">documentation section</a> below.
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-      These programs are modified versions of Stefan Reuther's <em>bdiff</em> and <em>bpatch</em> utilities, based on Pascal translations of the original C source code [<a class="direct-dl" href="http://phost.de/~stefan/Files/bdiff-current.zip" aria-label="Direct download of original C source code" title="Direct download of original C source code">Get the C source code</a>].
+      These programs are modified versions of Stefan Reuther's <em>bdiff</em> and <em>bpatch</em> utilities, based on Pascal translations of the original C source code. [<a class="direct-dl" href="https://drive.google.com/file/d/1KQ3k44NFkOdSDU7-OtNi7JKVs5Mr_gt1/view" title="File on Google drive containing of original C source code">Get the C source code from Google Drive</a>].
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