need convert_LTYPE_strings_area also for out_dxf, svg, json #3972

Job	Run time
ppc64-big-endian	6m 21s
linux (CFLAGS="-O0 -fno-omit-frame-pointer -fsanitize=address -fno-var-tracking" --disable-bindings)	5m 18s
linux (CC="clang")	5m 35s
linux (--enable-release)	5m 35s
linux (--enable-gcov --disable-bindings)	5m 36s
linux (--disable-write)	6m 2s
macOS	20m 33s
mingw	22m 27s
linux (CFLAGS="-O2 -m32" --disable-bindings)	5m 36s
linux-cmake	4m 19s
linux (CFLAGS="-O2 -fno-omit-frame-pointer -fsanitize=undefined -fno-var-tracking" --disable-bind...	5m 36s
mingw-cmake	7m 32s
mips32-big-endian	16m 50s
vs2019	4m 58s
vs2019-ninja	4m 17s
	2h 6m 35s

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