alsa-lib: don't pass --with-softfloat

Passing this option disables the lfloat and ladsp pcm plugins and certain
APIs as explained by:

https://patchwork.ozlabs.org/patch/619527/

But people might want to use these even if they use software floating point,
and the size difference is really minimal, so don't pass this option.

-rwxr-xr-x 1 peko peko 774K Jul  4 18:50 target-orig/usr/lib/libasound.so.2.0.0
-rwxr-xr-x 1 peko peko 709K Jul  4 19:08 target-softfloat/usr/lib/libasound.so.2.0.0

If people don't want the extra pcm plugins then they can simply be disabled
using BR2_PACKAGE_ALSA_LIB_PCM_PLUGINS.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/alsa-lib/alsa-lib.mk

@@ -62,10 +62,6 @@ else
 ALSA_LIB_CONF_OPTS += --disable-python
 endif
 
-ifeq ($(BR2_SOFT_FLOAT),y)
-ALSA_LIB_CONF_OPTS += --with-softfloat
-endif
-
 ifeq ($(BR2_bfin),y)
 # blackfin external toolchains don't have versionsort. Fake it using alphasort
 # instead