Patch cereal (#19091)

Change-Id: I9fe2a1490c8c31a4174aca4ed2e270aa1efa1a50

Co-authored-by: Eric Müller <mueller@kip.uni-heidelberg.de>

var/spack/repos/builtin/packages/cereal/LockGuard-default-ctor.patch

@@ -0,0 +1,13 @@
+diff -pur cereal/include/cereal/details/static_object.hpp cereal_new/include/cereal/details/static_object.hpp
+--- cereal/include/cereal/details/static_object.hpp	2020-05-06 11:10:09.251770253 +0200
++++ cereal_new/include/cereal/details/static_object.hpp	2020-05-06 11:11:00.904447455 +0200
+@@ -94,7 +94,8 @@ namespace cereal
+             std::unique_lock<std::mutex> lock;
+           #else
+           public:
+-	          LockGuard(LockGuard const &) = default; // prevents implicit copy ctor warning
++            LockGuard() = default;
++            LockGuard(LockGuard const &) = default; // prevents implicit copy ctor warning
+             ~LockGuard() CEREAL_NOEXCEPT {} // prevents variable not used
+           #endif
+         };

var/spack/repos/builtin/packages/cereal/package.py

@@ -31,6 +31,8 @@ class Cereal(CMakePackage):
     patch("Boost.patch")
     patch("Boost2.patch", when="@1.2.2:")
     patch("pointers.patch")
+    # fixed in HEAD but not released yet
+    patch("LockGuard-default-ctor.patch", when="@:1.3.999")
 
     depends_on('cmake@2.6.2:', type='build')