mn10300: replace deprecated "TOPDIR" with newer "srctree"

This would appear to be the last reference to TOPDIR in the entire tree, after
which i'm guessing that variable can be dropped.

Signed-off-by: Robert P. J. Day <[e-mail]>
Acked-by: David Howells <[e-mail]>
Cc: Sam Ravnborg <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/mn10300/boot/install.sh

···
 install -c -m 0755 $2 $4/vmlinuz
 install -c -m 0755 $5 $4/boot.rom
 install -c -m 0755 -d $4/../usr/include/linux
-cd $TOPDIR/include/linux
+cd ${srctree}/include/linux
 for i in `find . -maxdepth 1 -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/linux
 done
 install -c -m 0755 -d $4/../usr/include/linux/byteorder
-cd $TOPDIR/include/linux/byteorder
+cd ${srctree}/include/linux/byteorder
 for i in `find . -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/linux/byteorder
 done
 install -c -m 0755 -d $4/../usr/include/linux/lockd
-cd $TOPDIR/include/linux/lockd
+cd ${srctree}/include/linux/lockd
 for i in `find . -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/linux/lockd
 done
 install -c -m 0755 -d $4/../usr/include/linux/netfilter_ipv4
-cd $TOPDIR/include/linux/netfilter_ipv4
+cd ${srctree}/include/linux/netfilter_ipv4
 for i in `find . -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/linux/netfilter_ipv4
 done
 install -c -m 0755 -d $4/../usr/include/linux/nfsd
-cd $TOPDIR/include/linux/nfsd
+cd ${srctree}/include/linux/nfsd
 for i in `find . -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/linux/nfsd/$i
 done
 install -c -m 0755 -d $4/../usr/include/linux/raid
-cd $TOPDIR/include/linux/raid
+cd ${srctree}/include/linux/raid
 for i in `find . -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/linux/raid
 done
 install -c -m 0755 -d $4/../usr/include/linux/sunrpc
-cd $TOPDIR/include/linux/sunrpc
+cd ${srctree}/include/linux/sunrpc
 for i in `find . -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/linux/sunrpc
 done
 install -c -m 0755 -d $4/../usr/include/asm
-cd $TOPDIR/include/asm
+cd ${srctree}/include/asm
 for i in `find . -name '*.h' -print`; do
   install -c -m 0644 $i $4/../usr/include/asm
 done