ALSA: core: Build conditionally and remove superfluous ifdefs

Minor cleanups of Makefile to build some codes conditionally so that
a few ifdefs can be reduced.

Acked-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/info.c

@@ -33,12 +33,6 @@
 #include <linux/mutex.h>
 #include <stdarg.h>
 
-/*
- *
- */
-
-#ifdef CONFIG_PROC_FS
-
 int snd_info_check_reserved_words(const char *str)
 {
 	static char *reserved[] =
@@ -850,5 +844,3 @@ static int __init snd_info_version_init(void)
 	entry->c.text.read = snd_info_version_read;
 	return snd_info_register(entry); /* freed in error path */
 }
-
-#endif /* CONFIG_PROC_FS */