configure: Reset LIBS after ELF check
configure: Reset LIBS after ELF check

If action-if-found is not specified, AC_CHECK_LIB will append the library
to LIBS. As we don't want to link everything against libelf, reset LIBS
after doing the checks.

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