zmqpp: use more logical way of expressing comment dependencies

In most packages, we use 'depends on !A || !B || !C' and not 'depends
on !(A && B && C)' to express the dependencies of comments on missing
toolchain features. As suggested by Yann E. Morin, let's switch zmqpp
to this convention.

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

package/zmqpp/Config.in

@@ -15,8 +15,8 @@ config BR2_PACKAGE_ZMQPP
 	  http://github.com/benjamg/zmqpp
 
 comment "zmqpp needs a toolchain w/ C++, wchar, threads, gcc >= 4.6"
-	depends on !(BR2_INSTALL_LIBSTDCPP && BR2_USE_WCHAR && \
-		BR2_TOOLCHAIN_HAS_THREADS && BR2_TOOLCHAIN_GCC_AT_LEAST_4_6)
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR || \
+		!BR2_TOOLCHAIN_HAS_THREADS || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
 
 if BR2_PACKAGE_ZMQPP