opensp: Fix unnecessary rpath warnings

opensp: Fix unnecessary rpath warnings

Stale m4 macros seemed to be corrupting the opensp build. By removing
them, we can fix the warnings:

WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/spent contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/onsgmls contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/ospcat contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/osgmlnorm contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/sgmlnorm contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/ospent contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/ospam contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/nsgmls contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/spcat contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/osx contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/spam contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/sx contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/bin/sgml2xml contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/lib/libosp.so.3.0.0 contains probably-redundant RPATH /usr/lib
WARNING: QA Issue: opensp: /work/i586-poky-linux/opensp-1.5-r2/packages-split/opensp/usr/lib/libosp.so.3 contains probably-redundant RPATH /usr/lib

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>