[Libvir] don't clobber user-specified CFLAGS

[Daniel Veillard]

On Fri, Mar 23, 2007 at 07:59:33PM +0100, Jim Meyering wrote:
> Building libvirt with CFLAGS=-g doesn't work as expected: gcc runs
> without -g.  That was due to the following assignment that gives CFLAGS
> the value of an undefined variable.

  Okay, makes sense. Applied and commited, I just added 2 lines of comments
at the top of the file to document that extra change from the original GNOME
file.

  Thanks a lot !

Daniel

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