configure: Assume runtime cpu detection on arm on --target-os=android as well

Signed-off-by: Martin Storsjö <martin@martin.st>

configure

@@ -3804,7 +3804,7 @@ EOF
     enabled vfp     && check_insn vfp     'fadds s0, s0, s0'
     enabled vfpv3   && check_insn vfpv3   'vmov.f32 s0, #1.0'
 
-    [ $target_os = linux ] ||
+    [ $target_os = linux ] || [ $target_os = android ] ||
         map 'enabled_any ${v}_external ${v}_inline || disable $v' \
             $ARCH_EXT_LIST_ARM