Manpages of src:gambas3 in Debian bullseye-backports

• gambas3(1)
• gambas3.gambas(1)
• gba3(1)
• gbc3(1)
• gbh3(1)
• gbh3.gambas(1)
• gbi3(1)
• gbr3(1)
• gbs3(1)
• gbs3.gambas(1)
• gbw3(1)
• gbx3(1)