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RISC-V: fix rvv auto-detection on `gcc-13`

Sergei Trofimovich requested to merge trofi/pixman:gcc-13-rvv into master

Without the change auto-detection of rvv support is incomplete as it assumes vfloat32m1x4_t is always present if vfloat32m1_t is probed successfully.

It looks like at least on gcc-13.3.0 vfloat32m1_t is present while vfloat32m1x4_t is not. This causes build failure as:

../pixman/pixman-rvv.c:464:5: error: unknown type name 'vfloat32m1x4_t'; did you mean 'vfloat32m4_t'?
  464 |     vfloat32m1x4_t sa_sr_sg_sb, da_dr_dg_db, ma_mr_mg_mb;
      |     ^~~~~~~~~~~~~~
      |     vfloat32m4_t

The change probes for both types as both are used in pixman-rvv.c.

Tested on gcc-13, gcc-14, gcc-15.

Closes: #115 (closed)

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