remove duplicated code about hints in mcsat (#529) #509

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 31s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 34s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 11s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 51s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 38s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 11s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 58s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 18s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 28s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 58s
	1h 2m 38s

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