mimic: needs wchar support

Fixes:
http://autobuild.buildroot.net/results/9f7/9f7c1af4b9fd8331672c9096821db91d5f7f3aa1/
http://autobuild.buildroot.net/results/47f/47f5ec3fabefd85e62b675142bd6728904acd5d8/

At the same time fixup space/tabs for 'help' option.

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

package/mimic/Config.in

@@ -1,6 +1,10 @@
+comment "mimic needs a toolchain w/ wchar"
+	depends on !BR2_USE_WCHAR
+
 config BR2_PACKAGE_MIMIC
 	bool "mimic"
-        help
+	depends on BR2_USE_WCHAR
+	help
           Mimic is a fast, lightweight Text-to-speech engine developed
           by Mycroft A.I. and VocaliD, based on Carnegie Mellon
           University's Flite (Festival-Lite) software. Mimic takes in