Initial preparations for CURL and Discord integration.

module/Vendor/CURL/packages/DOS/README

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+Gisle Vanem made curl build fine on DOS (and MingW) with djgpp, OpenSSL and his
+Watt-32 stack.
+
+'make djgpp' in the root curl dir should build it fine.
+
+Note 1: djgpp 2.04 beta has a sscanf() bug so the URL parsing isn't
+        done properly. Use djgpp 2.03 until they fix it.
+
+Note 2: Compile Watt-32 (and OpenSSL) with the same version of djgpp.
+        Otherwise things go wrong because things like FS-extensions and
+        errnos have been changed between releases.