build: work around broken kernel header
I got this scary warning during ./configure on rawhide: checking linux/if_bridge.h usability... no checking linux/if_bridge.h presence... yes configure: WARNING: linux/if_bridge.h: present but cannot be compiled configure: WARNING: linux/if_bridge.h: check for missing prerequisite headers? configure: WARNING: linux/if_bridge.h: see the Autoconf documentation configure: WARNING: linux/if_bridge.h: section "Present But Cannot Be Compiled" configure: WARNING: linux/if_bridge.h: proceeding with the compiler's result configure: WARNING: ## ------------------------------------- ## configure: WARNING: ## Report this to libvir-list@redhat.com ## configure: WARNING: ## ------------------------------------- ## checking for linux/if_bridge.h... no * configure.ac (AC_CHECK_HEADERS): Provide struct in6_addr, since linux/if_bridge.h uses it without declaring it. (cherry picked from commit c308a9ae)
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