abicheck/run_abi_test: check for ../build; abicheck/apt_build.xml: fix version name

abicheck/apt_build.xml

@@ -1,5 +1,5 @@
 <version>
- ubuntu-branch
+ build-branch
 </version>
    
  <headers>

abicheck/run_abi_test

@@ -1,5 +1,10 @@
 #!/bin/sh
 
+if [ ! -d ../build ]; then
+	echo "../build missing, did you run make?"
+	exit 1
+fi
+
 LIBPATH=$(find /usr/lib/ -type f  -name "libapt-pkg*")
 sed s#@installed_libapt@#$LIBPATH# apt_installed.xml.in > apt_installed.xml