009d8fceab4 and 0a5e5534cbf8 moved the --enable-static configure flag
from package files to the default _CONFIGURE_CMDS in
package/Makefile.autotools.in.
This broke Autotools packages that override _CONFIGURE_CMDS.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>