libc/Kconfig: Remove source'ing file twice. Use cleaner dependencies in some menus.

libc/stdio/Kconfig

@@ -106,8 +106,6 @@ config EOL_IS_EITHER_CRLF
 
 endchoice
 
-source libc/time/Kconfig
-
 config MEMCPY_VIK
 	bool "Vik memcpy()"
 	default n

libc/tls/Kconfig

@@ -10,9 +10,8 @@ config ARCH_HAVE_TLS
 		Selected by the configuration system if the current architecture
 		supports TLS.
 
-if ARCH_HAVE_TLS
-
 menu "Thread Local Storage (TLS)"
+	depends on ARCH_HAVE_TLS
 
 config TLS
 	bool "Thread Local Storage (TLS)"
@@ -49,4 +48,3 @@ config TLS_NELEM
 
 endif # TLS
 endmenu # Thread Local Storage (TLS)
-endif # ARCH_HAVE_TLS

libc/wqueue/Kconfig

@@ -3,14 +3,12 @@
 # see the file kconfig-language.txt in the NuttX tools repository.
 #
 
-if BUILD_PROTECTED || BUILD_KERNEL
-
 menu "User Work Queue Support"
+	depends on (BUILD_PROTECTED || BUILD_KERNEL) && !DISABLE_SIGNALS
 
 config LIB_USRWORK
 	bool "User mode worker thread"
 	default n
-	depends on !DISABLE_SIGNALS
 	---help---
 		User space work queues can also be made available for deferred
 		processing in the NuttX kernel build.
@@ -38,4 +36,3 @@ config LIB_USRWORKSTACKSIZE
 
 endif # LIB_USRWORK
 endmenu # User Work Queue Support
-endif # BUILD_PROTECTED || BUILD_KERNEL