Use fedora 30 to cross compile kiwix-tools.

travis/f30_builder.dockerfile

@@ -0,0 +1,28 @@
+FROM fedora:30
+
+ENV LANG C.UTF-8
+
+RUN dnf install -y --nodocs \
+# Base build tools
+    make automake libtool cmake git-core subversion pkg-config gcc-c++ \
+    wget unzip ninja-build ccache which patch \
+# Cross win32 compiler
+    mingw32-gcc-c++ mingw32-bzip2-static mingw32-win-iconv-static \
+    mingw32-winpthreads-static mingw32-zlib-static mingw32-xz-libs-static \
+    mingw32-libmicrohttpd \
+# Other tools (to remove)
+#    vim less grep
+  && dnf remove -y "*-doc" \
+  && dnf autoremove -y \
+  && dnf clean all
+
+# Create user
+RUN useradd --create-home ci_builder
+USER ci_builder
+WORKDIR /home/ci_builder
+ENV PATH="/home/ci_builder/.local/bin:${PATH}"
+
+ENV TRAVIS_BUILD_DIR /home/ci_builder/kiwix-build
+ENV TRAVIS_OS_NAME linux_f30
+
+CMD pip3 install --user ./kiwix-build && kiwix-build/travis/compile_all.py