package/alsa-lib: move comment around, to keep proper indentation

In Kconfig, when there is an item (like a comment) between a symbol
and its dependees, then the indentation is not in effect.

Move the symbol to the top of the file to guarantee the indentation in
menuconfig.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

package/alsa-lib/Config.in

@@ -1,3 +1,6 @@
+comment "alsa-lib needs a toolchain w/ threads"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS
+
 config BR2_PACKAGE_ALSA_LIB
 	bool "alsa-lib"
 	# Temporary until
@@ -15,9 +18,6 @@ config BR2_PACKAGE_ALSA_LIB
 
 	  http://www.alsa-project.org/
 
-comment "alsa-lib needs a toolchain w/ threads"
-	depends on !BR2_TOOLCHAIN_HAS_THREADS
-
 if BR2_PACKAGE_ALSA_LIB
 
 config BR2_PACKAGE_ALSA_LIB_PYTHON