net-snmp: Disable parallel make
net-snmp: Disable parallel make

Sometime libsnmp.a is removed before it is called by other process.
Disable PARALLEL_MAKE to avoid error when run do_install.

Signed-off-by: Trung Do <64081e6b7eb2b24289b8a4e51cef9836ddf28af2@toshiba-tsdv.com>

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