* add bvi package
* add new package: cgdb
* add gdb in cgdb's TERMUX_PKG_DEPENDS
* add new package: redir
* bvi package revision 1: fix column number issue with clang (gcc does not seem to have this issue)
bvi (compiled with clang) incorrectly displayed only 12 bytes for each line on a 80-column terminal (instead of 16 bytes normally). command :set cm=## also had similar problems.
I found the issue was caused by the following statements:
sprintf(addr_form, "%%0%dllX ", AnzAdd);
AnzAdd = sprintf(tmp, addr_form, block_begin);
('block_begin''s data type is off_t)
gcc automatically typecasts 'block_begin' from off_t to loff_t,
on the otherhand, clang takes address of 'block_begin' and uses
it as loff_t thus writes some garbage value in 'tmp' string.
