Use correct option to compile a static binary in travis.

We must use custom option `static-linkage` instead of meson's
`default-library`.

travis/compile.sh

@@ -8,24 +8,17 @@ INSTALL_DIR=${BUILD_DIR}/INSTALL
 
 case ${PLATFORM} in
     "native_static")
-         MESON_OPTION="--default-library=static"
+         MESON_OPTION="-Dstatic-linkage=true"
          ;;
     "native_dyn")
-         MESON_OPTION="--default-library=shared"
+         MESON_OPTION=""
          ;;
     "win32_static")
-         MESON_OPTION="--default-library=static --cross-file ${BUILD_DIR}/meson_cross_file.txt"
+         MESON_OPTION="-Dstatic-linkage=true --cross-file ${BUILD_DIR}/meson_cross_file.txt"
          ;;
     "win32_dyn")
-         MESON_OPTION="--default-library=shared --cross-file ${BUILD_DIR}/meson_cross_file.txt"
+         MESON_OPTION="--cross-file ${BUILD_DIR}/meson_cross_file.txt"
          ;;
-    "android_arm")
-         MESON_OPTION="-Dandroid=true --default-library=shared --cross-file ${BUILD_DIR}/meson_cross_file.txt"
-         ;;
-    "android_arm64")
-         MESON_OPTION="-Dandroid=true --default-library=shared --cross-file ${BUILD_DIR}/meson_cross_file.txt"
-         ;;
-
 esac
 
 cd ${TRAVIS_BUILD_DIR}