Revert "qt4-x11-free: drop bbappend for 4.8.1"

This reverts commit bb3d744481.

meta-oe/recipes-qt/qt4/qt4-x11-free_4.8.1.bbappend

@@ -0,0 +1,6 @@
+DEPENDS += "mysql5 postgresql sqlite"
+QT_SQL_DRIVER_FLAGS = "-no-sql-ibase -plugin-sql-mysql -no-sql-odbc -plugin-sql-psql -plugin-sql-sqlite2 -plugin-sql-sqlite"
+QT_CONFIG_FLAGS += "-I${STAGING_INCDIR}/mysql \
+                    -I${STAGING_INCDIR}/postgresql"
+
+PRINC := "${@int(PRINC) + 1}"