tpm2-abrmd: declare dependency on a toolchain with C++

It depends on tpm2-tss, whose current version contains C++ code.

[Peter: add dependency to config option]
Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tpm2-abrmd/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_TPM2_ABRMD
 	bool "tpm2-abrmd"
+	depends on BR2_INSTALL_LIBSTDCPP # tpm2-tss
 	depends on BR2_USE_WCHAR # libglib2
 	depends on BR2_TOOLCHAIN_HAS_THREADS # dbus, libglib2
 	depends on BR2_USE_MMU # dbus, libglib2
@@ -20,6 +21,7 @@ config BR2_PACKAGE_TPM2_ABRMD
 
 	  https://github.com/tpm2-software/tpm2-abrmd
 
-comment "tpm2-abrmd needs a toolchain w/ wchar, threads"
+comment "tpm2-abrmd needs a toolchain w/ C++, wchar, threads"
 	depends on BR2_USE_MMU
-	depends on !BR2_USE_WCHAR || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR \
+		|| !BR2_TOOLCHAIN_HAS_THREADS