[WPE] Fix build warnings

[WPE] Fix build warnings
https://bugs.webkit.org/show_bug.cgi?id=178899

Reviewed by Carlos Alberto Lopez Perez.

Source/JavaScriptCore:

* PlatformWPE.cmake:

Source/WebCore:

These are actually mostly cross-platform issues.

* html/canvas/WebGL2RenderingContext.cpp:
(WebCore::arrayBufferViewElementSize):
* platform/Cairo.cmake:
* platform/Curl.cmake:
* platform/FreeType.cmake:
* platform/GCrypt.cmake:
* platform/graphics/texmap/TextureMapperShaderProgram.cpp:
(WebCore::TextureMapperShaderProgram::create):
* platform/network/soup/SoupNetworkSession.cpp:
(WebCore::SoupNetworkSession::SoupNetworkSession):

Source/WebKit:

* PlatformWPE.cmake:

Source/WTF:

* wtf/PlatformWPE.cmake:

Tools:

* TestWebKitAPI/Tests/WebKitGLib/TestDownloads.cpp:
(testContextMenuDownloadActions):
(testBlobDownload):
(beforeAll):
* TestWebKitAPI/Tests/WebKitGLib/TestResources.cpp:
* TestWebKitAPI/Tests/WebKitGLib/TestUIClient.cpp:
(testWebViewJavaScriptDialogs):
* TestWebKitAPI/Tests/WebKitGLib/TestWebExtensions.cpp:
* TestWebKitAPI/Tests/WebKitGLib/TestWebKitSettings.cpp:
* WebKitTestRunner/PlatformWPE.cmake:
* WebKitTestRunner/wpe/HeadlessViewBackend.cpp:
* WebKitTestRunner/wpe/TestControllerWPE.cpp:
(WTR::threadDefaultContext): Deleted.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@224192 268f45cc-cd09-0410-ab3c-d52691b4dbfc