gnu: Remove obsolete bootstrap workaround phases.
* gnu/packages/admin.scm (igt-gpu-tools)[arguments]: Don't set
NOCONFIGURE environment variable.
* gnu/packages/algebra.scm (givaro, fflas-ffpack, linbox),
* gnu/packages/arcan.scm (xarcan),
* gnu/packages/audio.scm (rtmidi),
* gnu/packages/cinnamon.scm (cinnamon-desktop),
* gnu/packages/gnome.scm (dia, libxklavier, byzanz),
* gnu/packages/image-viewers.scm (geeqie),
* gnu/packages/libusb.scm (libplist),
* gnu/packages/mail.scm (libetpan),
* gnu/packages/networking.scm (aircrack-ng),
* gnu/packages/terminals.scm (tilda, kmscon),
* gnu/packages/xorg.scm (xf86-video-intel, xcompmgr) [arguments]: Same.
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