Bug 93348 reports an ICE on certain cases of casts of expressions that
may appear only in unevaluated parts of integer constant expressions,
arising from the generation of nested C_MAYBE_CONST_EXPRs.  This patch
fixes it by adding a call to remove_c_maybe_const_expr in the
integer-operands case, as is done in other similar cases.

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

	PR c/93348
gcc/c:
	* c-typeck.c (build_c_cast): Call remove_c_maybe_const_expr on
	argument with integer operands.

gcc/testsuite:
	* gcc.c-torture/compile/pr93348-1.c: New test.