Don't set the SHELL variable in Makefile.am
Don't set the SHELL variable in Makefile.am

This cause libtool to be invoked with that shell, and you're limited
by the bugs in /bin/sh (it didn't work on my Solaris 10u9)

Change-Id: I5102c69f146dbd4588297097b00232b7e4ec1ed5
Reviewed-on: http://review.couchbase.org/8911
Tested-by: Volker Mische <fb414f8ac0dbbf87663550ae4ef5fc95b1041941@gmail.com>
Reviewed-by: Volker Mische <fb414f8ac0dbbf87663550ae4ef5fc95b1041941@gmail.com>

membase/libconflate,membase/libconflate,couchbase/libconflate,couchbase/libconflate