Add path when sourcing CONF.sh for compatibility with dash

Spotted by Ian Campbell.

build.sh

@@ -3,7 +3,7 @@
 # Script to build images for one or more architectures and/or source
 
 if [ -z "$CF" ] ; then
-    CF=CONF.sh
+    CF=./CONF.sh
 fi
 . $CF
 

build_all.sh

@@ -3,7 +3,7 @@
 # Script to build everything possible : sources and binaries for all archs
 
 if [ -z "$CF" ] ; then
-    CF=CONF.sh
+    CF=./CONF.sh
 fi
 . $CF
 

debian/changelog

@@ -12,6 +12,8 @@ debian-cd (3.1.3) UNRELEASED; urgency=low
     bootable. Avoids downloading x86 D-I images for all 30+ CDs in a full set.
   * Don't download floppy D-I images for i386; they're no longer available.
   * Don't fetch D-I images for the prep subarchitecture; it is not available.
+  * Add path when sourcing CONF.sh for compatibility with dash. Spotted by
+    Ian Campbell.
 
   [ Steve McIntyre ]
   * Remove bashism in tools/apt-selection. Closes: #530972

easy-build.sh

@@ -11,7 +11,7 @@ show_usage() {
 
 
 # Set configuration file to be used for the build and source it
-export CF=CONF.sh
+export CF=./CONF.sh
 . $CF
 export DEBIAN_CD_CONF_SOURCED=true
 unset UPDATE_LOCAL