Merge pull request #5516 from OpenMathLib/revert-4741-Pthread_Scalabi… #3564

Job	Run time
TEST (P6600, mipsisa64r6el-linux-gnuabi64, NO_SHARED=1 TARGET=P6600)	8m 9s
TEST (I6400, mipsisa64r6el-linux-gnuabi64, NO_SHARED=1 TARGET=I6400)	8m 14s
TEST (I6500, mipsisa64r6el-linux-gnuabi64, NO_SHARED=1 TARGET=I6500)	9m 39s
TEST (SICORTEX, mips64el-linux-gnuabi64, NO_SHARED=1 TARGET=SICORTEX)	7m 54s
TEST (MIPS64_GENERIC, mips64el-linux-gnuabi64, NO_SHARED=1 TARGET=MIPS64_GENERIC)	9m 45s
	43m 41s

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