Potrace under libs (again) for dvisvgm and mflua/mfluajit.

git-svn-id: svn://tug.org/texlive/trunk@64168 c570f23f-e606-0410-a88d-b1316a301751

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+
+	   POTRACE - transform bitmaps into vector graphics
+
+			  README for Windows
+  _________________________________________________________________
+
+This file contains instructions specific to the pre-compiled Windows
+distribution of Potrace. Please see the general README file and the
+man page for general information on usage, how to compile Potrace,
+etc.
+
+
+INSTALLATION for Windows:
+=========================
+
+Download the file potrace-XXX.win32.zip (or potrace-XXX.win64.zip if
+you want the 64-bit version).  Unpack it with your favorite unzipping
+tool, such as unzip, 7-Zip, WinZip, or just right-clicking on the
+file.
+
+If you have "tar" and "gunzip" installed, you may also get the tar.gz
+file instead of the zip file.
+
+The distribution includes the executable programs potrace.exe and
+mkbitmap.exe. You need to move these files to a place where Windows
+looks for programs, for example C:\WINDOWS. Alternatively, you can
+amend your PATH environment variable, by adding something like the
+following line to C:\AUTOEXEC.BAT:
+
+        PATH=%PATH%;C:\DIRECTORY\WHERE\FILES\ARE
+
+
+RUNNING:
+========
+
+For non-Windows specific usage information, see the file README.
+
+Potrace on Windows runs in much the same way as under Linux and other
+Unix-like operating systems. You must run Potrace from the command
+line (also known as the MSDOS Prompt). File names can be given in Unix
+style or Windows style, thus the following will both work:
+
+ potrace h:/data/file.txt
+ potrace h:\data\file.txt
+
+Wildcards can also be used, as in:
+
+ potrace h:\data\*.*
+ potrace h:/data/*.*