Handle clang 10 warnings:

+ fix -Wtautological-bitwise-compare
+ fix -Wimplicit-int-float-conversion
+ fix -Wmisleading-indentation
+ fix -Wrange-loop-construct
+ suppress -Wdeprecated-copy of 3rd party libs

src/Mod/Mesh/App/Core/Approximation.cpp

@@ -29,6 +29,12 @@
 # include <iterator> 
 #endif
 
+#if defined(__clang__) && defined(__has_warning)
+#if __has_warning("-Wdeprecated-copy")
+# pragma clang diagnostic ignored "-Wdeprecated-copy"
+#endif
+#endif
+
 #include "Approximation.h"
 #include "Elements.h"
 #include "Utilities.h"