Added tests to ensure linkage through libmvec *_finite aliases which are

defined in libmvec_nonshared.a (bug 19654).

    [BZ #19654]
    * sysdeps/x86_64/fpu/Makefile: Added new tests.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx-main.c: New.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx2-main.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx2-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx2.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx512-main.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx512-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-avx512.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-main.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-double-libmvec-alias.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx-main.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx2-main.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx2-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx2.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx512-main.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx512-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-avx512.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-main.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias-mod.c: Likewise.
    * sysdeps/x86_64/fpu/test-float-libmvec-alias.c: Likewise.
    * sysdeps/x86_64/fpu/test-libmvec-alias-mod.c: Likewise.