Fix check for linux/netlink.h on Linux 2.6.32-rc5+
Fix check for linux/netlink.h on Linux 2.6.32-rc5+

* configure.ac (AC_CHECK_HEADERS): In check for linux/netlink.h, include
sys/socket.h instead of linux/socket.h beforehand.

pgbovine/strace-plus,Yu-AndroidM/android_external_strace,YUPlayGodDev/platform_external_strace,lkundrak/strace,cuviper/strace,pgbovine/strace-plus,bnoordhuis/strace,geofft/strace,xin3liang/platform_external_strace,gcode-mirror/strace-plus,YUPlayGodDev/platform_external_strace,cuviper/strace,vrastogi/strace,jamel/strace-plus,Infinitive-OS/platform_external_strace,geekboxzone/mmallow_external_strace,geekboxzone/lollipop_external_strace,Yu-AndroidM/android_external_strace,Distrotech/strace,CyanogenMod/android_external_strace,CyanogenMod/android_external_strace,gcode-mirror/strace-plus,kapdop/android_external_strace,timmattison/strace-arm,YUPlayGodDev/platform_external_strace,kapdop/android_external_strace,CyanogenMod/android_external_strace,DirtyUnicorns/android_external_strace,Andrey9kin/revisor,lizh06/strace-plus,geofft/strace,pgbovine/strace-plus,Infinitive-OS/platform_external_strace,Distrotech/strace,lkundrak/strace,bnoordhuis/strace,android-ia/platform_external_strace,geekboxzone/lollipop_external_strace,AOSP-YU/platform_external_strace,bigzz/strace_android,gcode-mirror/strace-plus,geekboxzone/lollipop_external_strace,vrastogi/strace,timmattison/strace-arm,lkundrak/strace,gcode-mirror/strace-plus,cuviper/strace,geofft/strace,DirtyUnicorns/android_external_strace,cuviper/strace,vrastogi/strace,kapdop/android_external_strace,xin3liang/platform_external_strace,Saruta/strace,Andrey9kin/revisor,vrastogi/strace,geofft/strace,AOSP-YU/platform_external_strace,android-ia/platform_external_strace,Saruta/strace,AOSP-YU/platform_external_strace,MonkeyZZZZ/platform_external_strace,timmattison/strace-arm,Saruta/strace,Distrotech/strace,TeamExodus/external_strace,MonkeyZZZZ/platform_external_strace,jamel/strace-plus,DirtyUnicorns/android_external_strace,lizh06/strace-plus,cuviper/strace,Distrotech/strace,geofft/strace,TeamExodus/external_strace,dmullis/strace-ext,Saruta/strace,bigzz/strace_android,TeamExodus/external_strace,android-ia/platform_external_strace,android-ia/platform_external_strace,lizh06/strace-plus,AOSP-YU/platform_external_strace,geekboxzone/mmallow_external_strace,android-ia/platform_external_strace,dmullis/strace-ext,pgbovine/strace-plus,kapdop/android_external_strace,jamel/strace-plus,DirtyUnicorns/android_external_strace,geekboxzone/lollipop_external_strace,pombredanne/strace,pombredanne/strace,TeamExodus/external_strace,Infinitive-OS/platform_external_strace,CyanogenMod/android_external_strace,geekboxzone/mmallow_external_strace,CyanogenMod/android_external_strace,xin3liang/platform_external_strace,max630/strace,Infinitive-OS/platform_external_strace,pombredanne/strace,Infinitive-OS/platform_external_strace,pombredanne/strace,dmullis/strace-ext,xin3liang/platform_external_strace,jamel/strace-plus,YUPlayGodDev/platform_external_strace,Yu-AndroidM/android_external_strace,geekboxzone/lollipop_external_strace,lkundrak/strace,hjl-tools/strace,pgbovine/strace-plus,bnoordhuis/strace,bigzz/strace_android,vrastogi/strace,dmullis/strace-ext,dmullis/strace-ext,geekboxzone/mmallow_external_strace,Yu-AndroidM/android_external_strace,AOSP-YU/platform_external_strace,bigzz/strace_android,MonkeyZZZZ/platform_external_strace,gcode-mirror/strace-plus,lizh06/strace-plus,bnoordhuis/strace,Andrey9kin/revisor,TeamExodus/external_strace,bigzz/strace_android,max630/strace,hjl-tools/strace,Distrotech/strace,MonkeyZZZZ/platform_external_strace,Yu-AndroidM/android_external_strace,kapdop/android_external_strace,YUPlayGodDev/platform_external_strace,Andrey9kin/revisor,max630/strace,Saruta/strace,jamel/strace-plus,DirtyUnicorns/android_external_strace,geekboxzone/mmallow_external_strace,hjl-tools/strace,lizh06/strace-plus,MonkeyZZZZ/platform_external_strace