Use correct fp_env definition for OpenBSD

[ron-at-swgy]

This commit includes OpenBSD in the list of definitions checked when adding exceptions to the control flags of the floating point environment on OpenBSD. Similar to FreeBSD, the flags are contained in an x87 struct within the fp_env structure.

For reference, the official CVSWeb repository shows a definition of:

/*
 * fenv_t represents the entire floating-point environment.
 */
typedef struct {
        struct {
                unsigned int __control;         /* Control word register */
                unsigned int __status;          /* Status word register */
                unsigned int __tag;             /* Tag word register */
                unsigned int __others[4];       /* EIP, Pointer Selector, etc */
        } __x87;
        unsigned int __mxcsr;                   /* Control, status register */
} fenv_t;

Note

This change was intended to be included in #4257 but was erroneously left out when I packaged the PR yesterday.

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