package/tpm2-pkcs11: needs threads

tpm2-pkcs11 fails to build without threads since its addition with
commit 42db2c7236c2249ec02608ed714fa6f95e36161b

Fixes:
 - http://autobuild.buildroot.org/results/8218776da34cc4a20663ae6737ad7727b12d8cd2

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

package/tpm2-pkcs11/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_TPM2_PKCS11
 	bool "tpm2-pkcs11"
 	depends on !BR2_STATIC_LIBS # tpm2-tss
+	depends on BR2_TOOLCHAIN_HAS_THREADS
 	select BR2_PACKAGE_LIBYAML
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_SQLITE
@@ -10,5 +11,5 @@ config BR2_PACKAGE_TPM2_PKCS11
 
 	  https://github.com/tpm2-software/tpm2-pkcs11
 
-comment "tpm2-pkcs11 needs a toolchain w/ dynamic library"
-	depends on BR2_STATIC_LIBS
+comment "tpm2-pkcs11 needs a toolchain w/ dynamic library, threads"
+	depends on BR2_STATIC_LIBS || !BR2_TOOLCHAIN_HAS_THREADS