util: string: use #pragma once in headers
util: string: use #pragma once in headers

Signed-off-by: Jonathon Jongsma <c7254805a17bd5c41e24c3a278fcbf3afcdfb0fa@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>
Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

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