Fix test failure for loong64

xiaojuan zhairequested to merge
zhaixiaojuan/libjpeg-turbo:master into master

When I build on loong64 I get the following error:

The following tests FAILED:

 93 - djpeg-shared-3x2-float-prog-cmp (Failed)
248 - djpeg-static-3x2-float-prog-cmp (Failed)

Errors while running CTest

make[1]: *** [Makefile:74：test] 错误 8

make[1]: 离开目录“/home/debian/libjpeg-turbo-pro/salsa/libjpeg-turbo-2.1.5/obj-loongarch64-linux-gnu”

dh_auto_test: error: cd obj-loongarch64-linux-gnu && make -j4 test ARGS+=--verbose ARGS+=-j4 returned exit code 2

make: *** [debian/rules:54：binary] 错误 25

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