configure: remove some unnecessary backslashes

Originally committed as revision 19937 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -2741,33 +2741,33 @@ cmp -s $TMPH config.h &&
 
 # build tree in object directory if source path is different from current one
 if enabled source_path_used; then
-    DIRS="\
-        doc               \
-        libavcodec        \
-        libavcodec/$arch  \
-        libavdevice       \
-        libavfilter       \
-        libavformat       \
-        libavutil         \
-        libavutil/$arch   \
-        libpostproc       \
-        libswscale        \
-        libswscale/$arch  \
-        tests             \
-        tools             \
+    DIRS="
+        doc
+        libavcodec
+        libavcodec/$arch
+        libavdevice
+        libavfilter
+        libavformat
+        libavutil
+        libavutil/$arch
+        libpostproc
+        libswscale
+        libswscale/$arch
+        tests
+        tools
     "
-    FILES="\
-        Makefile             \
-        common.mak           \
-        subdir.mak           \
-        doc/texi2pod.pl      \
-        libavcodec/Makefile  \
-        libavdevice/Makefile \
-        libavfilter/Makefile \
-        libavformat/Makefile \
-        libavutil/Makefile   \
-        libpostproc/Makefile \
-        libswscale/Makefile  \
+    FILES="
+        Makefile
+        common.mak
+        subdir.mak
+        doc/texi2pod.pl
+        libavcodec/Makefile
+        libavdevice/Makefile
+        libavfilter/Makefile
+        libavformat/Makefile
+        libavutil/Makefile
+        libpostproc/Makefile
+        libswscale/Makefile
     "
     for dir in $DIRS ; do
         mkdir -p $dir