ltrace: fix visibility of Config.in comment

The BR2_PACKAGE_LTRACE option has some architecture dependencies, but
those architecture dependencies are not taken into account for the
Config.in comment.

To fix this, this commit introduces a BR2_PACKAGE_LTRACE_ARCH_SUPPORTS
hidden boolean that gets used by both the BR2_PACKAGE_LTRACE option
and the Config.in comment.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/ltrace/Config.in

@@ -1,10 +1,20 @@
+config BR2_PACKAGE_LTRACE_ARCH_SUPPORTS
+	bool
+	default y if BR2_arm
+	default y if BR2_i386
+	default y if BR2_mips
+	default y if BR2_mipsel
+	default y if BR2_powerpc
+	default y if BR2_sparc
+	default y if BR2_x86_64
+	default y if BR2_xtensa
+
 config BR2_PACKAGE_LTRACE
 	bool "ltrace"
 	depends on BR2_USE_WCHAR # elfutils
 	depends on !BR2_STATIC_LIBS # elfutils
 	depends on BR2_TOOLCHAIN_USES_UCLIBC || BR2_TOOLCHAIN_USES_GLIBC # elfutils
-	depends on (BR2_i386 || BR2_arm || BR2_mips || BR2_mipsel \
-		|| BR2_powerpc || BR2_sparc || BR2_x86_64 || BR2_xtensa)
+	depends on BR2_PACKAGE_LTRACE_ARCH_SUPPORTS
 	select BR2_PACKAGE_ELFUTILS
 	help
 	  Debugging program which runs a specified command until it
@@ -15,5 +25,6 @@ config BR2_PACKAGE_LTRACE
 	  http://ltrace.org
 
 comment "ltrace needs a uClibc or glibc toolchain w/ wchar, dynamic library"
+	depends on BR2_PACKAGE_LTRACE_ARCH_SUPPORTS
 	depends on !BR2_USE_WCHAR || BR2_STATIC_LIBS \
 		|| !(BR2_TOOLCHAIN_USES_UCLIBC || BR2_TOOLCHAIN_USES_GLIBC)