Updates for ccosh[f] and csinh[f]

• lib/msun/src/s_ccosh.c: . Update Copyright years. . sin() and cos() are needed at the same time, so use sincos() to compute values. This does argument reduction once instead of twice. . Replace '* 0.5' with '/ 2'. This reduces diff with s_ccoshf.c. . For (LDBL_MANT_DIG == 53), add weak references for ccoshl and ccosl.

• lib/msun/src/s_ccoshf.c: . Update Copyright years. . sin() and cos() are needed at the same time, so use sincos() to compute values. This does argument reduction once instead of twice. . Replace '* 0.5F' with '/ 2'. This reduces diff with s_ccoshf.c.

• lib/msun/src/s_csinh.c: . Update Copyright years. . sin() and cos() are needed at the same time, so use sincos() to compute values. This does argument reduction once instead of twice. . Replace '* 0.5' with '/ 2'. This reduces diff with s_csinhf.c. . For (LDBL_MANT_DIG == 53), add weak references for csinhl and csinl.

• lib/msun/src/s_csinhf.c: . Update Copyright years. . sin() and cos() are needed at the same time, so use sincos() to compute values. This does argument reduction once instead of twice. . Replace '* 0.5F' with '/ 2'. This reduces diff with s_ccoshf.c.

PR: 288740
MFC after: 1 week