Remove this one added 'just to be sure' that is now blocking the build.

CURA-12675

Author: rburema

conanfile.py

@@ -136,9 +136,6 @@ def generate(self):
 
     def build(self):
         cmake = CMake(self)
-
-        cmake.compiler_definitions["_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR"] = 1
-
         cmake.configure()
         cmake.build()