Adding md5c to the build is already handled by src/Makefile but that
one only kicks in if EXTRAOBJS is not set at all.
This fixes accidental build (and inclusion) of the md5 code that is
normally used from OpenSSL or GnuTLS if one of them is detected.
- src/disk.c, server/monitor.c: Add gkrellm_disk_add_by_name() that allows creating disks with a custom label from sysdep code.
- src/Makefile, server/Makefile: Cleanup of darwin/darwin9/macosx targets. All custom variables are now set in src/Makefile and server/Makefile to allow easy building inside these subdirs. Removed very old link-flags which were used before OS X 10.3.
- All Makefiles: Remove unused GTK_CONFIG definitions, they were neither passed as an argument nor executed anywhere.
- Makefile: Update comments documenting Darwin and OS X targets (darwin, darwin9 and macosx)
- src/sysdeps/darwin.c: Use utmpx instead of deprecated utmp.
- src/sysdeps/darwin.c: Fix possible leak in gkrellm_sys_cpu_init(), pinfo was never free'd.
- src/sysdeps/darwin.c: Rewrite disk device enumeration and performance gathering. The previous implementation failed as soon as a single device contained no medium, resulting in no/wrong performance data for all subsequent devices. Also provides labels for krells based on real device-names (uses new gkrellm_disk_add_by_name()).