spec: fix LTYPE for r13-2004 for in_dxf #3965

Job	Run time
linux-cmake	4m 20s
linux (CFLAGS="-O0 -fno-omit-frame-pointer -fsanitize=address -fno-var-tracking" --disable-bindings)	8m 33s
linux (CC="clang")	9m 33s
macOS	10m 54s
linux (--enable-release)	10m 59s
mingw	10m 48s
mingw-cmake	6m 34s
linux (--enable-gcov --disable-bindings)	10m 58s
linux (--disable-write)	8m 57s
mips32-big-endian	10m 58s
ppc64-big-endian	6m 30s
linux (CFLAGS="-O2 -m32" --disable-bindings)	9m 42s
vs2019	5m 58s
linux (CFLAGS="-O2 -fno-omit-frame-pointer -fsanitize=undefined -fno-var-tracking" --disable-bind...	10m 57s
vs2019-ninja	4m 45s
	2h 10m 26s

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