mongrel2: add missing comment for toolchain option dependencies

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mongrel2/Config.in

@@ -1,3 +1,10 @@
+comment "mongrel2 needs a toolchain w/ C++, IPv6, threads, largefile, wchar"
+	depends on BR2_UCLIBC_VERSION_SNAPSHOT || \
+		BR2_TOOLCHAIN_USES_GLIBC || \
+		BR2_arm
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_INET_IPV6 || \
+		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_LARGEFILE || !BR2_USE_WCHAR
+
 config BR2_PACKAGE_MONGREL2
 	bool "mongrel2"
 	select BR2_PACKAGE_SQLITE