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like CPU count

handy, if we want to run parallel builds

even I couldn't remember what this is needed for...

Closes: https://github.com/umlaeute/Gem/issues/19

GEM_CHECK_LIB should not not run AC_CHECK_...  if it has been
explicitely disabled via "--without-..."

Closes https://github.com/umlaeute/Gem/issues/25

Signed-off-by: Antoine Villeret <antoine.villeret@gmail.com>

Closes sourceforge pd-gem/bugs/209

avoid more crashes

strlen(NULL) is undefined behaviour, which makes open_via_path(NULL,...)
crash on some systems.
so we now use a proper C-string
that only consists of the terminating 0-byte.

this should *really* close sf-bug #225

Fixes sourceforge's pd-gem/bugs/225

and how to set your own picture

rather than dummy "main".
this commit is really UNTESTED on relevant platforms (w32)

rather than dummy "main"

rather than !HAVE_LIBGLEW.
this is necessary after updating the GEM_CHECK_LIB.

check: why is there no HAVE_GEM_LIB_GLEW or the like?

PKG_FOO is used in messages.
PKG_FOO_PKG_ERRORS is used to store per-pkg errors (?)

not needed any more (has it ever been needed?)

rather than on the library check