dpkg: improved to determine the major version of perl for using it to compose PERL_LIBDIR instead of hard-coding "perl5"

archiver/dpkg/dpkg.conf

@@ -23,4 +23,7 @@ var_append extraconfopt ' ' '--without-start-stop-daemon'
 
 # set libdir for dpkg perl modules so dpkg tools written in perl
 # will actually find them to work properly
-var_append makeinstopt ' ' "PERL_LIBDIR=$root/$SDECFG_PKG_PERL5_VENDOR_PREFIX/lib/perl5/vendor_perl/$(pkgprefix ver perl)/$arch_target"
+perl_version=$(pkgprefix ver perl)
+major_version=$(echo $perl_version | cut -d '.' -f1)
+
+var_append makeinstopt ' ' "PERL_LIBDIR=$root/$SDECFG_PKG_PERL5_VENDOR_PREFIX/lib/perl$major_version/vendor_perl/$perl_version/$arch_target"