configure: Require libelf 0.8.12
configure: Require libelf 0.8.12

Older versions don't have the required API.

(Commit message written by Colin Walters <walters@verbum.org>)

https://bugzilla.gnome.org/show_bug.cgi?id=673253

01org/android-bluez-glib,iConsole/Console-OS_external_bluetooth_glib,bluez-android/glib,pstglia/external-bluetooth-glib,pstglia/platform-external-bluetooth-glib,pstglia/platform-external-bluetooth-glib,pstglia/platform-external-bluetooth-glib,bluez-android/glib,bluez-android/glib,01org/android-bluez-glib,justinkb/aosp-bluez.glib,iConsole/Console-OS_external_bluetooth_glib,justinkb/aosp-bluez.glib,justinkb/aosp-bluez.glib,justinkb/aosp-bluez.glib,pstglia/external-bluetooth-glib,pstglia/external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib,darren-clark/android_platform_external_bluetooth_glib,bluez-android/glib,pstglia/platform-external-bluetooth-glib,justinkb/aosp-bluez.glib,darren-clark/android_platform_external_bluetooth_glib,01org/android-bluez-glib,01org/android-bluez-glib,01org/android-bluez-glib,iConsole/Console-OS_external_bluetooth_glib,bluez-android/glib,pstglia/external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib,iConsole/Console-OS_external_bluetooth_glib,pstglia/external-bluetooth-glib,iConsole/Console-OS_external_bluetooth_glib,pstglia/platform-external-bluetooth-glib,darren-clark/android_platform_external_bluetooth_glib