GitLab

Squashed the following commits:

* Solaris: Get LWP enumeration working
* Solaris: Make showing and hiding of kernel threads behave
* Solaris: remove usage of lwpstatus that is no longer needed
* Solaris: no discrete access to parent proc structure needed
* Solaris: Restore runtime MaxPid detection after LWP changes
* Solaris: Workaround virtual PID signal issue by shadowing kill() with a macro
* Solaris: Fix unintention double-shifting of virtual PID for LWP enumeration
* Solaris: Add LWPID to default display since LWP enumeration is also default
* Solaris: use PAGE_SIZE_KB from Process.h instead of custom definition
* Solaris: stop LWP enumeration at 1023 LWPs per proc since that is all we can handle in the virtual PID

Signed-off-by: Hisham Muhammad <hisham@gobolinux.org>

Keep scanning threads for versions before High Sierra 13.0.0 and after 13.3.0.

`make htop-headers` will regenerate all '.h' headers in htop source for
all platforms.
`make clean-htop-headers` will delete all generated htop headers.

Because of the introduction of these two targets, I slightly changed
the style of platform-specific portions of makefile rules.
Please comment if you accept such a style, or need me to revert to old
style.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>

Use the same method that ps and top use to determine if a
process is a kernel thread on Linux: check if cmdline is empty.

Thanks to @wangqr's investigation reported here:
https://github.com/hishamhm/htop/issues/761#issuecomment-375306069

Fixes #761.

Thanks to @gzip4 for tracking this down.

Closes #764.