more strict compiler rvv checks

[nihui]

No description provided.

[codecov-commenter]

Codecov Report

Merging #4094 (f1fdad1) into master (720f3c9) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4094   +/-   ##
=======================================
  Coverage   94.42%   94.42%           
=======================================
  Files         747      747           
  Lines      178747   178747           
=======================================
+ Hits       168778   168789   +11     
+ Misses       9969     9958   -11     

Impacted Files	Coverage Δ
src/layer/riscv/absval_riscv.cpp	100.00% <ø> (ø)
src/layer/riscv/binaryop_riscv.cpp	100.00% <ø> (ø)
src/layer/riscv/cast_riscv.cpp	95.58% <ø> (ø)
src/layer/riscv/clip_riscv.cpp	100.00% <ø> (ø)
src/layer/riscv/concat_riscv.cpp	95.58% <ø> (ø)
src/layer/riscv/convolution1d_riscv.cpp	99.00% <ø> (ø)
src/layer/riscv/convolution_riscv.cpp	98.96% <ø> (ø)
src/layer/riscv/convolutiondepthwise_riscv.cpp	97.22% <ø> (ø)
src/layer/riscv/crop_riscv.cpp	97.26% <ø> (ø)
src/layer/riscv/deconvolution_riscv.cpp	98.23% <ø> (ø)
... and 28 more

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