libsoxr: remove unicode dash from help text

This would make the unicode challenged menuconfig show something
sensible.

Split the sentence for the text to make sense.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libsoxr/Config.in

@@ -2,7 +2,7 @@ config BR2_PACKAGE_LIBSOXR
 	bool "libsoxr"
 	help
 	  The SoX Resampler library `libsoxr' performs one-dimensional
-	  sample-rate conversion—it may be used, for example, to
+	  sample-rate conversion. It may be used, for example, to
 	  resample PCM-encoded audio.
 
 	  It aims to give fast and high quality results for any constant