imgvtopgm-2.0-bp155.3.7

- switch to https urls

- Add imgvtopgm-lib-cleanup.patch: cleanup usage of libraries after
  netpbm has been changed to no loner provide all compatibility
  names (due to conflicts with openpgm).

- Update homepage URL, remove ancient/redundant sections from
  specfile, use modern macros.

- added libnetpbm-devel to buildreq

- Don't strip binaries.

- converted neededforbuild to BuildRequires

- add -lm to help configure with netpbm

- use RPM_OPT_FLAGS, fixed all implicit warnings.

- fixed gcc warnings

- add %defattr

- removed bogus self-provides

- removed aclocal, autoconf and automake

- change gz to bz2

- create this package for view images on Palm