drop ROS_DISTRO STRGREATER tests

As the Debian packages use "Debian"
https://salsa.debian.org/science-team/ros-ros-environment/-/blame/master/debian/rules?ref_type=heads#L6
which is incompatible, does not trigger them

c++14 is the default from melodic onward, so the additional statements
there are not necessary

jsk_interactive_markers/jsk_interactive_marker/CMakeLists.txt

@@ -1,9 +1,8 @@
 cmake_minimum_required(VERSION 2.8.3)
 project(jsk_interactive_marker)
 
-if("$ENV{ROS_DISTRO}" STRGREATER "melodic")
-  add_compile_options(-std=c++14)
-else()
+if("$ENV{ROS_DISTRO}" STREQUAL "kinetic")
+  # catch special case ROS kinetic where c++11 is not the default yet
   add_compile_options(-std=c++11)
 endif()
 

jsk_rqt_plugins/CMakeLists.txt

@@ -32,7 +32,7 @@ install(DIRECTORY launch resource sample sample_scripts test
 
 if (CATKIN_ENABLE_TESTING)
   find_package(rostest REQUIRED)
-  if("$ENV{ROS_DISTRO}" STRGREATER "indigo")
+  if(NOT "$ENV{ROS_DISTRO}" STREQUAL "indigo")
     catkin_add_nosetests(test)
     add_rostest(test/test_rqt_plugins.test)
   endif()

jsk_rviz_plugins/CMakeLists.txt

@@ -4,9 +4,8 @@
 # http://ros.org/doc/groovy/api/catkin/html/user_guide/supposed.html
 cmake_minimum_required(VERSION 2.8.3)
 project(jsk_rviz_plugins)
-if("$ENV{ROS_DISTRO}" STRGREATER "melodic")
-  add_compile_options(-std=c++14)
-else()
+if("$ENV{ROS_DISTRO}" STREQUAL "kinetic")
+  # catch special case ROS kinetic where c++11 is not the default yet
   add_compile_options(-std=c++11)
 endif()
 # Load catkin and all dependencies required for this package