Disable cpu feature detection on armv7

Index: babl/babl-cpuaccel.c
--- babl/babl-cpuaccel.c.orig
+++ babl/babl-cpuaccel.c
@@ -579,6 +579,7 @@ arch_accel (void)
 static guint32
 arch_accel (void)
 {
+#if 0 // disable on armv7
   /* TODO : add or hardcode the other ways it can be on arm, where
    *        this info comes from the system and not from running cpu
    *        instructions
@@ -599,6 +600,9 @@ arch_accel (void)
     close (fd);
   }
   return has_neon?BABL_CPU_ACCEL_ARM_NEON:0;
+#else
+  return 0;
+#endif
 }
 
 #endif /* ARCH_ARM  */
