package/valgrind: hide comment when arch is not supported

Currently, the comment that "valgrind needs shared libs" is not hidden
when the architecture dependencies are not met, which can confuse some
users (as recently seen on IRC).

Fix that by introducing the traditional _ARCH_SUPPORTS option, and have
the comment and the symbol depend on that.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Brandon Maier <brandon.maier@rockwellcollins.com>
Cc: Jérôme Pouiller <jezz@sysmic.org>
Cc: Peter Seiderer <ps.report@gmx.net>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Reviewed--by: Pedro Ribeiro <pedrib@gmail.com>
Tested-by: Pedro Ribeiro <pedrib@gmail.com>
[Arnout: put _ARCH_SUPPORTS at the top of the file]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/valgrind/Config.in

@@ -1,14 +1,19 @@
+config BR2_PACKAGE_VALGRIND_ARCH_SUPPORTS
+	bool
+	default y if BR2_ARM_CPU_ARMV7A
+	default y if BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
+	default y if BR2_i386 || BR2_x86_64
+	default y if BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le
+	depends on !BR2_MIPS_SOFT_FLOAT
+
 comment "valgrind needs a toolchain w/ dynamic library"
+	depends on BR2_PACKAGE_VALGRIND_ARCH_SUPPORTS
 	depends on BR2_STATIC_LIBS
 
 config BR2_PACKAGE_VALGRIND
 	bool "valgrind"
-	depends on BR2_ARM_CPU_ARMV7A || BR2_i386 || \
-		   BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el || \
-		   BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le || \
-		   BR2_x86_64
+	depends on BR2_PACKAGE_VALGRIND_ARCH_SUPPORTS
 	depends on !BR2_STATIC_LIBS
-	depends on !BR2_MIPS_SOFT_FLOAT
 	help
 	  Tool for debugging and profiling Linux programs.