[EFL] Do not consider test directories when DEVELOPER_MODE is OFF

[EFL] Do not consider test directories when DEVELOPER_MODE is OFF
https://bugs.webkit.org/show_bug.cgi?id=146171

Reviewed by Gyuyoung Kim.

.:

* Source/cmake/OptionsEfl.cmake:
Exposed ENABLE_DEVELOPER_MODE to Compiler and CMake definition when DEVELOPER_MODE is ON.

Source/WebCore:

* platform/efl/EflInspectorUtilities.cpp:
(WebCore::inspectorResourcePath): Only used WEB_INSPECTOR_DIR which CMake decides properly.

Source/WebKit2:

* PlatformEfl.cmake:
Do not define SOURCE_DIR when DEVELOPER_MODE is OFF for seccomp filter
not to allow jhbuild directory.
* Shared/efl/ProcessExecutablePathEfl.cpp:
(WebKit::findProcessPath): Guard test code to ENABLE(DEVELOPER_MODE).

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@185790 268f45cc-cd09-0410-ab3c-d52691b4dbfc