type_info: avoid gcc-7 -Wsign-conversion warning (#301) #97

Job	Run time
linux (g++, g++, 10, -DBUILD_UVW_SHARED_LIB=ON)	59s
linux (g++, g++, 10, -DBUILD_UVW_LIBS=ON)	1m 9s
linux (g++, g++, 10, -DBUILD_UVW_LIBS=OFF)	1m 9s
linux (g++, g++, 11, -DBUILD_UVW_SHARED_LIB=ON)	55s
linux (g++, g++, 11, -DBUILD_UVW_LIBS=ON)	58s
linux (g++, g++, 11, -DBUILD_UVW_LIBS=OFF)	52s
linux (g++, g++, 12, -DBUILD_UVW_SHARED_LIB=ON)	1m 5s
linux (g++, g++, 12, -DBUILD_UVW_LIBS=ON)	1m 3s
linux (g++, g++, 12, -DBUILD_UVW_LIBS=OFF)	1m 12s
linux (clang, clang++, 12, -DBUILD_UVW_SHARED_LIB=ON)	1m 6s
linux (clang, clang++, 12, -DBUILD_UVW_LIBS=ON)	55s
linux (clang, clang++, 12, -DBUILD_UVW_LIBS=OFF)	1m 7s
linux (clang, clang++, 13, -DBUILD_UVW_SHARED_LIB=ON)	1m 4s
linux (clang, clang++, 13, -DBUILD_UVW_LIBS=ON)	53s
linux (clang, clang++, 13, -DBUILD_UVW_LIBS=OFF)	1m 1s
linux (clang, clang++, 14, -DBUILD_UVW_SHARED_LIB=ON)	51s
linux (clang, clang++, 14, -DBUILD_UVW_LIBS=ON)	52s
linux (clang, clang++, 14, -DBUILD_UVW_LIBS=OFF)	46s
	17m 57s

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