Remove nlohmann JSON version check

- The git submodule is pinned to that version, which should be enough of a hint that this is the version we expect. If someone builds with a different version and it passes tests, we should not block that.

CMakeLists.txt

@@ -39,11 +39,9 @@ option(PEDANTIC "Enable extra warnings and pedantic build flags. Treat all warni
 option(PROFILE_OPTIMIZER_STEPS "Output performance metrics for the optimiser steps." OFF)
 option(USE_SYSTEM_LIBRARIES "Use system libraries" OFF)
 option(ONLY_BUILD_SOLIDITY_LIBRARIES "Only build solidity libraries" OFF)
-option(STRICT_NLOHMANN_JSON_VERSION "Strictly check installed nlohmann json version" ON)
 mark_as_advanced(PROFILE_OPTIMIZER_STEPS)
 mark_as_advanced(USE_SYSTEM_LIBRARIES)
 mark_as_advanced(ONLY_BUILD_SOLIDITY_LIBRARIES)
-mark_as_advanced(STRICT_NLOHMANN_JSON_VERSION)
 
 # Setup cccache.
 include(EthCcache)

libsolutil/JSON.cpp

@@ -28,12 +28,6 @@
 
 #include <sstream>
 
-#ifdef STRICT_NLOHMANN_JSON_VERSION_CHECK
-static_assert(
-	(NLOHMANN_JSON_VERSION_MAJOR == 3) && (NLOHMANN_JSON_VERSION_MINOR == 11) && (NLOHMANN_JSON_VERSION_PATCH == 3),
-	"Unexpected nlohmann-json version. Expecting 3.11.3.");
-#endif
-
 namespace solidity::util
 {