[SYCL] Always use dynamic CRT for Unit tests (#1515)

Signed-off-by: Alexander Batashev <alexander.batashev@intel.com>

sycl/unittests/CMakeLists.txt

@@ -1,6 +1,12 @@
 add_custom_target(SYCLUnitTests)
 set_target_properties(SYCLUnitTests PROPERTIES FOLDER "SYCL tests")
 
+foreach(flag_var
+    CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
+    CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
+string(REGEX REPLACE "/MT" "/MD" ${flag_var} "${${flag_var}}")
+endforeach()
+
 # add_sycl_unittest(test_dirname SHARED|OBJECT file1.cpp, file2.cpp ...)
 #
 # Will compile the list of files together and link against SYCL.