Revert "grub2: add PKG_FIXUP:=autoreconf"

this caused build errors on x86

This reverts commit a0ea22ac43.

Signed-off-by: John Crispin <john@phrozen.org>

package/boot/grub2/Makefile

@@ -19,7 +19,6 @@ PKG_SOURCE_URL:=http://alpha.gnu.org/gnu/grub \
 	http://www.nic.funet.fi/pub/gnu/alpha/gnu/grub/
 PKG_MD5SUM:=be62932eade308a364ea4bbc91295930
 
-PKG_FIXUP:=autoreconf
 HOST_BUILD_PARALLEL:=1
 PKG_BUILD_DEPENDS:=grub2/host