thunderbird: Work around slow NFS access with NSS_SDB_USE_CACHE=1

Accessing the certificate store over the network takes a long time, and
blocks Thunderbird for several minutes. Work around it by setting
`NSS_SDB_USE_CACHE=1`.

thunderbird.be0

@@ -79,7 +79,12 @@ mee_install() {
 
 mee_install_post() {
     start_cmd install -d ${D}${LIBDIR}/mariux64
-    start_cmd mv ${D}${BINDIR}/${PKGNAME} ${D}${LIBDIR}/mariux64/${PKGNAME}
+    start_cmd rm ${D}${BINDIR}/${PKGNAME}
+
+    cat >${D}${LIBDIR}/mariux64/${PKGNAME}<<-EOF
+	NSS_SDB_USE_CACHE=1 exec "${LIBDIR}/${PKGNAME}/${PKGNAME}" "\$@"
+	EOF
+    chmod 755 ${D}${LIBDIR}/mariux64/${PKGNAME}
 
     # install official icon in all sizes