dcmtk package is build using ICU on Debian, remove invalid setting for
ICONV this is confusing.
Info: Building DCMTK with character set conversion support using the ICU
-DDCMTK_WITH_DOXYGEN:BOOL=$(BUILDDOC) \
-DDCMTK_WITH_TIFF:BOOL=ON \
-DDCMTK_WITH_ZLIB:BOOL=ON \
- -DDCMTK_WITH_ICONV:BOOL=ON \
+ -DDCMTK_WITH_ICONV:BOOL=OFF \
-DUSE_COMPILER_HIDDEN_VISIBILITY:BOOL=ON \
-DCMAKE_VERBOSE_MAKEFILE=ON \
-DCMAKE_INSTALL_DATADIC:STRING=share/libdcmtk16 \