i370.h (TARGET_CPU_CPP_BUILTINS): Remove spurious trailing backslash in comment preceeding macro definition.

	* i370.h (TARGET_CPU_CPP_BUILTINS): Remove spurious trailing
	backslash in comment preceeding macro definition.
	* i370/linux.h (TARGET_OS_CPP_BUILTINS): Likewise.
	* i370/mvs.h (TARGET_OS_CPP_BUILTINS): Likewise.
	* i370/oe.h (TARGET_OS_CPP_BUILTINS): Likewise.

From-SVN: r56221