decrease the libapt-inst major version again to 1.1 as the increase

was a backport error and is not needed (and destroys our non-abi-break hack)

apt-inst/makefile

@@ -11,7 +11,7 @@ include ../buildlib/defaults.mak
 
 # The library name
 LIBRARY=apt-inst
-MAJOR=1.2
+MAJOR=1.1
 MINOR=0
 SLIBS=$(PTHREADLIB) -lapt-pkg
 APT_DOMAIN:=libapt-inst$(MAJOR)