configure: Do not put arguments into double quotes

configure: Do not put arguments into double quotes

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14777

This could create an issue that arguments don't get split by python and then the
following could happen:

    ./configure --libdir=/usr/lib64 --enable-clangdb

    LIBDIR='/usr/lib64 --enable-clangdb'

This ends then up in parameters.all.xml:

    <!ENTITY pathconfig.LIBDIR   '/usr/lib64 --enable-clangdb'>

The python parser then errors out:

    xml.etree.ElementTree.ParseError: not well-formed (invalid token)

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Aug  3 18:36:37 UTC 2021 on sn-devel-184

(cherry picked from commit e2962b4262fc4a7197a3fcbd010fcfaca781baea)