build for cordova an android is now optional, only if tools are available

configure.ac

@@ -29,9 +29,12 @@ AX_BUILD_HTML
 #AX_CHECK_QT([QT], [QtCore QtGui QtNetwork], [QtWidgets])
 #AX_QT_NO_KEYWORDS
 
+AC_CHECK_PROG(CORDOVA, [cordova android], [yes], [no],
+                       [${PATH}${PATH_SEPARATOR}${ANDROID_HOME}/tools])
+AM_CONDITIONAL(CORDOVA, [test ${CORDOVA} = "yes"])
 AC_CONFIG_FILES([html/index.html])
-AC_CONFIG_FILES([cordova/config.xml])
 AC_CONFIG_FILES([cordova/makefile])
+AC_CONFIG_FILES([cordova/config.xml])
 
 # create output
 AC_OUTPUT

cordova/makefile.am

@@ -8,8 +8,10 @@ EXTRA_DIST = config.xml.in ${cordova_sources}
 ANDROID = safechat.apk
 #ANDROID_SRC = platforms/android/build/outputs/apk/android-release-unsigned.apk
 ANDROID_SRC = platforms/android/build/outputs/apk/android-debug.apk
+if CORDOVA
 wwwdir = ${pkgdatadir}/html
 www_DATA = ${ANDROID}
+endif
 
 ${ANDROID_SRC}:
 	for file in ${cordova_sources}; do \