eina: Remove `gnu_source.patch` which was applied upstream.

eina: Remove `gnu_source.patch` which was applied upstream.

Something similar to this patch was applied upstream r53157 [1] which closes upstream ticket 537 [2].

	$ git grep EFL_SRCREV
	classes/e-base.bbclass:EFL_SRCREV ?= "55157"

This change is build tested with the following configurations.

	Build Configuration:
	BB_VERSION        = "1.10.0"
	METADATA_BRANCH   = "org.openembedded.dev"
	METADATA_REVISION = "842f05d"
	TARGET_ARCH       = "arm"
	TARGET_OS         = "linux-gnueabi"
	MACHINE           = "beagleboard"
	DISTRO            = "minimal"
	DISTRO_VERSION    = "dev-snapshot-20101203"
	TARGET_FPU        = "hard"

	Build Configuration:
	BB_VERSION        = "1.10.0"
	METADATA_BRANCH   = "org.openembedded.dev"
	METADATA_REVISION = "842f05d"
	TARGET_ARCH       = "arm"
	TARGET_OS         = "linux-uclibceabi"
	MACHINE           = "beagleboard"
	DISTRO            = "minimal-uclibc"
	DISTRO_VERSION    = "dev-snapshot-20101203"
	TARGET_FPU        = "hard"

[1] http://trac.enlightenment.org/e/changeset/53157
[2] https://trac.enlightenment.org/e/ticket/537

Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
CC: Henning Heinold <heinold@inf.fu-berlin.de>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>