better arch detection

Signed-off-by: Toshaan Bharvani <toshaan@powerel.org>

SPECS/sgabios.spec

@@ -10,11 +10,9 @@ License:        ASL 2.0
 URL:            https://github.com/qemu/sgabios
 Source0:        sgabios-%{date}-git%{hash}.tar.xz
 
-%if ppc64 ppc64le aarch64
+%ifarch ppc64 ppc64le aarch64
 BuildRequires:  binutils-x86_64-linux-gnu gcc-x86_64-linux-gnu
 Buildarch: noarch
-%else
-ExclusiveArch: %{ix86} x86_64
 %endif
 BuildRequires:  make
 BuildRequires:  gcc
@@ -52,7 +50,7 @@ characters for later collection after an operating system boots.
 unset MAKEFLAGS
 make \
         HOSTCC=gcc \
-%if ppc64 ppc64le aarch64
+%ifarch ppc64 ppc64le aarch64
         CC=x86_64-linux-gnu-gcc \
         AS=x86_64-linux-gnu-as \
         LD=x86_64-linux-gnu-ld \