bdwgc: no need to set ARM_INSTRUCTION_SET anymore

It was necessary in 2012 (https://patchwork.openembedded.org/patch/26155/),
but it appears to no longer be required.

Signed-off-by: Chris Laplante <chris.laplante@agilent.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/bdwgc/bdwgc_8.0.4.bb

@@ -28,8 +28,6 @@ SRC_URI = "git://github.com/ivmai/bdwgc.git;branch=release-8_0"
 
 S = "${WORKDIR}/git"
 
-ARM_INSTRUCTION_SET = "arm"
-
 inherit autotools pkgconfig
 
 EXTRA_OECONF += "--enable-cpluscplus"