libgcrypt: Do not restrict to ARM ISA

This works ok with thumb2 as well now a days
It was added in 2006
http://git.openembedded.org/openembedded/commit/?id=037b00e3d629962e8d2bc4fcc944c9ecf9a240be

(From OE-Core rev: 9f3401eb2c7ee6a4cf9c1b0cdeb61c8c0fdd2301)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/libgcrypt/libgcrypt.inc

@@ -47,6 +47,4 @@ PACKAGES =+ "dumpsexp-dev"
 FILES_${PN}-dev += "${bindir}/hmac256"
 FILES_dumpsexp-dev += "${bindir}/dumpsexp"
 
-ARM_INSTRUCTION_SET = "arm"
-
 BBCLASSEXTEND = "native nativesdk"