Specify that LIBADD libraries are for libqof_backend_qsf.la.

Solves:
      libqof-backend-qsf.so: undefined symbol: xmlNodeGetContent

      error during `make check'


git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@12362 57a11ea4-9604-0410-9ed3-97b8803252fd

lib/libqof/backend/file/Makefile.am

@@ -14,7 +14,7 @@ libqof_backend_qsf_la_SOURCES = \
   qsf-xml-map.c \
   qsf-xml.c
 
-LIBADD = \
+libqof_backend_qsf_la_LIBADD = \
  ${QOF_LIBS} \
  ${GLIB_LIBS} \
  ${LIBXML2_LIBS}