Added shell commands so build works with bison 1.28. That version treats the -o option differently than the 2.x version.
Added shell commands so build works with bison 1.28. That
version treats the -o option differently than the 2.x version.

M Makefile.am

OPENDAP/libdap,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap,OPENDAP/libdap,OPENDAP/libdap4,OPENDAP/libdap,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4