qemu: Fix build on RHEL-6
qemu: Fix build on RHEL-6

Commit c29e6d4805 cause build failure on RHEL-6:

../../src/qemu/qemu_capabilities.c: In function 'virQEMUCapsIsValid':
../../src/qemu/qemu_capabilities.c:4085: error: declaration of 'ctime'
shadows a global declaration [-Wshadow]
/usr/include/time.h:258: error: shadowed declaration is here [-Wshadow]

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

libvirt/libvirt,jfehlig/libvirt,eskultety/libvirt,libvirt/libvirt,eskultety/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jfehlig/libvirt,crobinso/libvirt,zippy2/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,taget/libvirt,VenkatDatta/libvirt,eskultety/libvirt,andreabolognani/libvirt,jardasgit/libvirt,eskultety/libvirt,taget/libvirt,nertpinx/libvirt,crobinso/libvirt,jfehlig/libvirt,jardasgit/libvirt,datto/libvirt,taget/libvirt,libvirt/libvirt,olafhering/libvirt,eskultety/libvirt,fabianfreyer/libvirt,zippy2/libvirt,andreabolognani/libvirt,zippy2/libvirt,datto/libvirt,jfehlig/libvirt,jardasgit/libvirt,crobinso/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,nertpinx/libvirt,taget/libvirt,nertpinx/libvirt,olafhering/libvirt,jardasgit/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,taget/libvirt,datto/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,datto/libvirt,datto/libvirt,andreabolognani/libvirt,libvirt/libvirt,crobinso/libvirt,zippy2/libvirt,olafhering/libvirt,VenkatDatta/libvirt