package/grpc: add host gcc >= 4.9 comment

Commit e98610f039b88a5d164b19343d5ecef2d1c01f6d forgot to update comment

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/grpc/Config.in

@@ -20,7 +20,7 @@ config BR2_PACKAGE_GRPC
 
 	  http://github.com/grpc/grpc
 
-comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9"
+comment "grpc needs a toolchain w/ C++, threads, dynamic library, gcc >= 4.9, host gcc >= 4.9"
 	depends on BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS
 	depends on BR2_TOOLCHAIN_HAS_SYNC_4 || BR2_TOOLCHAIN_HAS_ATOMIC
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \