nt/configure.bat (end): Unset environment variables used by this batch file.

nt/ChangeLog

 2010-12-31  Eli Zaretskii  <eliz@gnu.org>
 
+	* configure.bat (end): Unset environment variables used by this
+	batch file.
+
 	* INSTALL: Update the information about PNG support libraries.
 	(Bug#7716)
 

nt/configure.bat

@@ -670,6 +670,19 @@ set userldflags=
 set doldflags=
 set mingwflag=
 set mf=
+set pngsupport=
+set jpegsupport=
+set gifsupport=
+set tiffsupport=
+set xpmsupport=
+set svgsupport=
+set libsOK=
+set HAVE_GIF=
+set HAVE_JPEG=
+set HAVE_PNG=
+set HAVE_TIFF=
+set HAVE_XPM=
+set dbginfo=
 
 goto skipArchTag
    arch-tag: 300d20a4-1675-4e75-b615-7ce1a8c5376c