updated build system

docker/x86_64/mingw64

@@ -1004,6 +1004,58 @@ RUN if [ -f "/3rd_party/sdl-${MY_SDL_VERSION}.tar.gz" ]; then \
       && rm -r SDL-release-${MY_SDL_VERSION} \
    ; fi
 
+ARG LIBTASN_VERSION
+ENV MY_LIBTASN_VERSION=${LIBTASN_VERSION}
+RUN if [ -f "/3rd_party/libtasn1-${MY_LIBTASN_VERSION}.tar.gz" ]; then \
+      tar xvzf /3rd_party/libtasn1-${MY_LIBTASN_VERSION}.tar.gz \
+      && cd libtasn1-${MY_LIBTASN_VERSION} \
+      && ./configure \
+        --disable-doc \
+        --enable-static=yes \
+        --enable-shared=no \
+        --host=${MY_MINGW_PREFIX} \
+        --prefix=${MY_MINGW_DIR} \
+      && make -j${MY_NUM_JOBS} \
+      && make install \
+      && cd ${MY_WORKDIR} \
+      && rm -r libtasn1-${MY_LIBTASN_VERSION} \
+    ; fi
+
+ARG LIBICONV_VERSION
+ENV MY_LIBICONV_VERSION=${LIBICONV_VERSION}
+RUN if [ -f "/3rd_party/libiconv-${MY_LIBICONV_VERSION}.tar.gz" ]; then \
+      tar xvzf /3rd_party/libiconv-${MY_LIBICONV_VERSION}.tar.gz \
+      && cd libiconv-${MY_LIBICONV_VERSION} \
+      && ./configure \
+        --enable-static=yes \
+        --enable-shared=no \
+        --host=${MY_MINGW_PREFIX} \
+        --prefix=${MY_MINGW_DIR} \
+      && make -j${MY_NUM_JOBS} \
+      && make install \
+      && cd ${MY_WORKDIR} \
+      && rm -r libiconv-${MY_LIBICONV_VERSION} \
+    ; fi
+
+ARG LIBDSM_VERSION
+ENV MY_LIBDSM_VERSION=${LIBDSM_VERSION}
+RUN if [ -f "/3rd_party/libdsm-${MY_LIBDSM_VERSION}.tar.gz" ]; then \
+      tar xvxf /3rd_party/libdsm-${MY_LIBDSM_VERSION}.tar.gz \ 
+      && cd libdsm-${MY_LIBDSM_VERSION} \
+      && meson setup \
+        --cross-file ${MY_TOOLCHAIN_FILE_MESON} \
+        --prefix=${MY_MINGW_DIR} \
+        -Dbinaries=false \
+        -Ddefault_library=static \
+        _build \
+      && meson compile \
+        -C _build \
+      && meson install \
+        -C _build \
+      && cd ${MY_WORKDIR} \
+      && rm -r libdsm-${MY_LIBDSM_VERSION} \
+    ; fi
+
 RUN (mv ${MY_MINGW_DIR}/lib/*.dll ${MY_MINGW_DIR}/bin || echo "no dll's found") \
     && chmod 0777 -R ${MY_MINGW_DIR} \
     && rm -rf /3rd_party