revert adding gtkmm as dependency

Author: wavecommander

linux/CMakeLists.txt

@@ -27,7 +27,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CEF_ROOT}/cmake")
 find_package(CEF REQUIRED)
 
 find_package(PkgConfig REQUIRED)
-pkg_check_modules(GTK REQUIRED gtkmm-3.0)
+pkg_check_modules(GTK REQUIRED gtk+-3.0)
 
 # This value is used when generating builds using this plugin, so it must
 # not be changed.
@@ -72,7 +72,7 @@ target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
 target_include_directories(${PLUGIN_NAME} INTERFACE
   "${CMAKE_CURRENT_SOURCE_DIR}/include")
 target_link_libraries(${PLUGIN_NAME} PRIVATE flutter)
-target_link_libraries(${PLUGIN_NAME} PRIVATE ${GTKMM_LIBRARIES})
+target_link_libraries(${PLUGIN_NAME} PRIVATE ${GTK_LIBRARIES})
 
 target_include_directories(${PLUGIN_NAME} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../common")