Set default f90 MPI bindings to disabled.

This commit was SVN r4460.

config/ompi_configure_options.m4

@@ -139,8 +139,8 @@ fi
 AC_MSG_CHECKING([if want Fortran 90 bindings])
 AC_ARG_ENABLE(f90, 
     AC_HELP_STRING([--enable-f90],
-                   [enable f90 MPI bindings (default: enabled)]))
-if test "$enable_f90" != "no"; then
+                   [enable f90 MPI bindings (default: disabled)]))
+if test "$enable_f90" = "yes"; then
     AC_MSG_RESULT([yes])
     OMPI_WANT_F90_BINDINGS=1
 else