Remove epicsThrows() macro

Exception specifications are deprecated: http://isocpp.github.io/
CppCoreGuidelines/CppCoreGuidelines.html#e30-dont-use-exception-
specifications . They will be removed from the C++ standard with
C++20. Modern compilers are warning about them since years. Thus
it's unlikely that anyone is still using the epicsThrows() macro.
Even if that's the case the fix is trivial: Simply remove the macro.

modules/libcom/src/osi/compiler/clang/compilerSpecific.h

@@ -33,10 +33,8 @@
 
 /*
  * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
- * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
  */
 #define CXX_PLACEMENT_DELETE
-#define CXX_THROW_SPECIFICATION
 
 #endif /* __cplusplus */
 

modules/libcom/src/osi/compiler/gcc/compilerSpecific.h

@@ -40,9 +40,7 @@
 
 /*
  * CXX_PLACEMENT_DELETE - defined if compiler supports placement delete
- * CXX_THROW_SPECIFICATION - defined if compiler supports throw specification
  */
-#define CXX_THROW_SPECIFICATION
 #define CXX_PLACEMENT_DELETE
 
 #endif /* __cplusplus */

modules/libcom/src/osi/compilerDependencies.h

@@ -20,18 +20,6 @@
 
 #ifdef __cplusplus
 
-/*
- * usage: void func () epicsThrows (( std::bad_alloc, std::logic_error ))
- *
- * Note: now a widely accepted concensus (ref Meyers and C++ faq) is that 
- * one should avoid using throw specifications in C++ code
- */
-#if defined ( CXX_THROW_SPECIFICATION )
-#   define epicsThrows(X) throw X
-#else
-#   define epicsThrows(X)
-#endif
-
 /*
  * usage: epicsPlacementDeleteOperator (( void *, myMemoryManager & ))
  */