tools: Remove obsolete build-deb tool.
tools: Remove obsolete build-deb tool.

This hasn't been used in ages, and isn't useful with the current
codebase.

showell/zulip,dhcrzf/zulip,tommyip/zulip,tommyip/zulip,andersk/zulip,dhcrzf/zulip,mahim97/zulip,rht/zulip,rht/zulip,showell/zulip,andersk/zulip,shubhamdhama/zulip,andersk/zulip,hackerkid/zulip,tommyip/zulip,eeshangarg/zulip,tommyip/zulip,hackerkid/zulip,rishig/zulip,kou/zulip,kou/zulip,rishig/zulip,kou/zulip,zulip/zulip,zulip/zulip,tommyip/zulip,zulip/zulip,jackrzhang/zulip,eeshangarg/zulip,hackerkid/zulip,showell/zulip,mahim97/zulip,synicalsyntax/zulip,jackrzhang/zulip,shubhamdhama/zulip,synicalsyntax/zulip,dhcrzf/zulip,punchagan/zulip,mahim97/zulip,brainwane/zulip,timabbott/zulip,mahim97/zulip,shubhamdhama/zulip,synicalsyntax/zulip,shubhamdhama/zulip,hackerkid/zulip,kou/zulip,showell/zulip,hackerkid/zulip,eeshangarg/zulip,jackrzhang/zulip,timabbott/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,jackrzhang/zulip,brainwane/zulip,dhcrzf/zulip,rishig/zulip,shubhamdhama/zulip,punchagan/zulip,kou/zulip,rishig/zulip,shubhamdhama/zulip,punchagan/zulip,showell/zulip,jackrzhang/zulip,synicalsyntax/zulip,synicalsyntax/zulip,punchagan/zulip,brainwane/zulip,timabbott/zulip,rht/zulip,andersk/zulip,dhcrzf/zulip,brainwane/zulip,synicalsyntax/zulip,timabbott/zulip,zulip/zulip,shubhamdhama/zulip,showell/zulip,rht/zulip,brainwane/zulip,rishig/zulip,dhcrzf/zulip,jackrzhang/zulip,dhcrzf/zulip,rishig/zulip,brainwane/zulip,tommyip/zulip,rht/zulip,timabbott/zulip,zulip/zulip,mahim97/zulip,timabbott/zulip,synicalsyntax/zulip,andersk/zulip,rht/zulip,jackrzhang/zulip,zulip/zulip,rishig/zulip,eeshangarg/zulip,timabbott/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,tommyip/zulip,mahim97/zulip,showell/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,punchagan/zulip,brainwane/zulip,punchagan/zulip,andersk/zulip