### intprops: revise _WRAPV macros, revert _OVERFLOW

The incompatible changes to the _OVERFLOW macros were too much of a hassle in practice, so revert them. Instead, change the new _WRAPV macros to make them closer in behavior to GCC 5's new builtin_add_overflow etc. functions. No other software was using these newly-added macros yet, so this should be OK. * NEWS: Revert previous change, since the incompatible change has been reverted, and nobody used the incompatible version. * doc/intprops.texi (Wraparound Arithmetic, Integer Type Overflow): Document revised behavior. (Integer Range Overflow): Adjust example to match above revisions. * lib/intprops.h (INT_ADD_OVERFLOW, INT_SUBTRACT_OVERFLOW) (INT_MULTIPLY_OVERFLOW): Revert previous change, so that these can be used in integer constant expressions again. (INT_CONST_ADD_OVERFLOW, INT_CONST_SUBTRACT_OVERFLOW) (INT_CONST_MULTIPLY_OVERFLOW): Remove, as these are no longer needed. (INT_CONST_ADD_WRAPV, INT_CONST_SUBTRACT_WRAPV) (INT_NEGATE_WRAPV, INT_CONST_MULTIPLY_WRAPV, INT_DIVIDE_WRAPV) (INT_REMAINDER_WRAPV, INT_LEFT_SHIFT_WRAPV): Remove, as they did not seem that useful. (INT_ADD_WRAPV, INT_SUBTRACT_WRAPV, INT_MULTIPLY_WRAPV) (_GL_INT_OP_WRAPV, _GL_INT_OP_WRAPV_LONGISH) (_GL_INT_OP_WRAPV_VIA_UNSIGNED): Support new semantics. (__has_builtin): New macro, if not alreay defined. (_GL__GENERIC_BOGUS, _GL_INT_OP_CALC, _GL_INT_OP_CALC1): New macros. * tests/test-intprops.c (INT_CONST_DIVIDE_OVERFLOW) (INT_CONST_REMAINDER_OVERFLOW, INT_CONST_LEFT_SHIFT_OVERFLOW) (INT_CONST_DIVIDE_WRAPV, INT_CONST_REMAINDER_WRAPV) (INT_CONST_LEFT_SHIFT_WRAPV): Remove. (CHECK_SBINOP, CHECK_SSUM, CHECK_SUM1, CHECK_SSUM1) (CHECK_SDIFFERENCE, CHECK_SPRODUCT, CHECK_PRODUCT1, CHECK_SPRODUCT1): New macros. (CHECK_BINOP, CHECK_UNOP, main, CHECK_SUM): Test new behavior.

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