tpm2-tools: allow building without stack smashing protection (SSP)

Disable SSP if the toolchain does not support it. This must be done
explicitly because configure enables hardening by default but doesn't
contain a link test, so it doesn't detect when libssp is missing.

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tpm2-tools/tpm2-tools.mk

@@ -10,4 +10,8 @@ TPM2_TOOLS_LICENSE = BSD-2-Clause
 TPM2_TOOLS_LICENSE_FILES = LICENSE
 TPM2_TOOLS_DEPENDENCIES = dbus libcurl libglib2 openssl tpm2-tss host-pkgconf
 
+# configure.ac doesn't contain a link test, so it doesn't detect when
+# libssp is missing.
+TPM2_TOOLS_CONF_OPTS = $(if $(BR2_TOOLCHAIN_HAS_SSP),--enable-hardening,--disable-hardening)
+
 $(eval $(autotools-package))