Adjust to the 64 bit time_t in musl 1.2.2 by keeping time
internally in RRD still as 'long', so that old databases
created during musl 1.1.x still work in 32 bit targets.

That also helps with several interal functions that use 'long'
for calculations and printf formatting.

* Define internal type TIME_INT as 'long', and use that
  internally in calculations
* Use time_t vs. TIME_INT casting when necessary
* Provide time_t variable pointers for functions expecting
  a time_t pointer.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

Fixes compilation without host pod2man.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

The crude loop I wrote to come up with this changeset:

  find -L package/feeds/packages/ -name patches | \
  sed 's/patches$/refresh/' | sort | xargs make

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>

The y-axis graph labels in logarithmic mode display in 'scientific'
notation eg: '1e+00' for 0, '1e+01' for 10, '1e+02' for 100 and so on.
This IMO is a pain in the backside for non scientific humans to read.

Modified output to display numbers up to 99,999 in conventional decimal
format and to revert to scientific notation for larger, thus the same
display space is taken.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

While we're at it, relocate from libs/ to utils/ as it provides executables
and change the directory name from rrdtool-1.0.x to rrdtool1 to make it match
the source package name.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>