dahdi-linux: add patch to fix 32bit targets

dahdi-linux: add patch to fix 32bit targets

On some 32 bit targets dahdi-linux currently fails to build.

Examples:

ERROR: "__divdi3" [/builder/shared-workdir/build/sdk/build_dir/target-powerpc_8540_musl/linux-mpc85xx_generic/dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp_usb.ko] undefined!
ERROR: "__udivdi3" [/builder/shared-workdir/build/sdk/build_dir/target-powerpc_8540_musl/linux-mpc85xx_generic/dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp_usb.ko] undefined!
ERROR: "__moddi3" [/builder/shared-workdir/build/sdk/build_dir/target-powerpc_8540_musl/linux-mpc85xx_generic/dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp.ko] undefined!
ERROR: "__divdi3" [/builder/shared-workdir/build/sdk/build_dir/target-powerpc_8540_musl/linux-mpc85xx_generic/dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp.ko] undefined!

or

ERROR: "__aeabi_ldivmod" [/store/buildbot/slave/shared-workdir/build/sdk/build_dir/target-arm_arm1176jzf-s+vfp_musl_eabi/linux-bcm27xx_bcm2708/dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp_usb.ko] undefined!
ERROR: "__aeabi_uldivmod" [/store/buildbot/slave/shared-workdir/build/sdk/build_dir/target-arm_arm1176jzf-s+vfp_musl_eabi/linux-bcm27xx_bcm2708/dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp_usb.ko] undefined!
ERROR: "__aeabi_ldivmod" [/store/buildbot/slave/shared-workdir/build/sdk/build_dir/target-arm_arm1176jzf-s+vfp_musl_eabi/linux-bcm27xx_bcm2708/dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp.ko] undefined!

Problem was reported to upstream already by third party ([1]). Patch
attached to bug report is not sufficient.

This commit adds a patch from PLD Linux ([2]) to address the build
failures.

[1] https://issues.asterisk.org/jira/browse/DAHLIN-371
[2] https://github.com/pld-linux/dahdi-linux/blob/master/math64.patch

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>