Make minstall work with Solaris /bin/sh

Solaris /bin/sh doesn't set $PWD for you

Signed-off-by: Brian Paul <brian.paul@tungstengraphics.com>
diff --git a/bin/minstall b/bin/minstall
index 819b2bc..8ee9608 100755
--- a/bin/minstall
+++ b/bin/minstall
@@ -42,6 +42,8 @@
 			exit 0
 		fi
 
+		PWDSAVE=`pwd`
+
 		# determine file's type
 		if [ -h "$FILE" ] ; then
 			#echo $FILE is a symlink
@@ -57,7 +59,6 @@
 
 			FILE=`basename "$FILE"`
 			# Go to $DEST and make the link
-			PWDSAVE="$PWD"
 			cd "$DEST"        # pushd
 				$RM "$FILE"
 				$SYMLINK "$TARGET" "$FILE"