Use WindowlessEglApplication for windowless apps on non-desktop GLES.

It "just works", yay!

CMakeLists.txt

@@ -226,9 +226,14 @@ if(BUILD_GL_TESTS)
     elseif(CORRADE_TARGET_APPLE)
         set(WITH_WINDOWLESSCGLAPPLICATION ON)
         set(GL_TEST_LIBRARIES Magnum MagnumWindowlessCglApplication)
-    elseif(CORRADE_TARGET_UNIX AND (NOT MAGNUM_TARGET_GLES OR MAGNUM_TARGET_DESKTOP_GLES))
+    elseif(CORRADE_TARGET_UNIX)
+        if(MAGNUM_TARGET_GLES AND NOT MAGNUM_TARGET_DESKTOP_GLES)
+            set(WITH_WINDOWLESSEGLAPPLICATION ON)
+            set(GL_TEST_LIBRARIES Magnum MagnumWindowlessEglApplication)
+        else()
             set(WITH_WINDOWLESSGLXAPPLICATION ON)
             set(GL_TEST_LIBRARIES Magnum MagnumWindowlessGlxApplication)
+        endif()
     elseif(CORRADE_TARGET_WINDOWS)
         if(NOT MAGNUM_TARGET_GLES OR MAGNUM_TARGET_DESKTOP_GLES)
             set(WITH_WINDOWLESSWGLAPPLICATION ON)

src/Magnum/Platform/magnum-info.cpp

@@ -66,7 +66,11 @@
 #elif defined(CORRADE_TARGET_APPLE)
 #include "Magnum/Platform/WindowlessCglApplication.h"
 #elif defined(CORRADE_TARGET_UNIX)
+#if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_DESKTOP_GLES)
+#include "Magnum/Platform/WindowlessEglApplication.h"
+#else
 #include "Magnum/Platform/WindowlessGlxApplication.h"
+#endif
 #elif defined(CORRADE_TARGET_WINDOWS)
 #if !defined(MAGNUM_TARGET_GLES) || defined(MAGNUM_TARGET_DESKTOP_GLES)
 #include "Magnum/Platform/WindowlessWglApplication.h"

src/Magnum/Test/AbstractOpenGLTester.h

@@ -38,8 +38,12 @@
 #include "Magnum/Platform/WindowlessIosApplication.h"
 #elif defined(CORRADE_TARGET_APPLE)
 #include "Magnum/Platform/WindowlessCglApplication.h"
-#elif defined(CORRADE_TARGET_UNIX) && (!defined(MAGNUM_TARGET_GLES) || defined(MAGNUM_TARGET_DESKTOP_GLES))
+#elif defined(CORRADE_TARGET_UNIX)
+#if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_DESKTOP_GLES)
+#include "Magnum/Platform/WindowlessEglApplication.h"
+#else
 #include "Magnum/Platform/WindowlessGlxApplication.h"
+#endif
 #elif defined(CORRADE_TARGET_WINDOWS)
 #if !defined(MAGNUM_TARGET_GLES) || defined(MAGNUM_TARGET_DESKTOP_GLES)
 #include "Magnum/Platform/WindowlessWglApplication.h"

src/Magnum/Text/fontconverter.cpp

@@ -37,7 +37,11 @@
 #elif defined(CORRADE_TARGET_APPLE)
 #include "Magnum/Platform/WindowlessCglApplication.h"
 #elif defined(CORRADE_TARGET_UNIX)
+#if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_DESKTOP_GLES)
+#include "Magnum/Platform/WindowlessEglApplication.h"
+#else
 #include "Magnum/Platform/WindowlessGlxApplication.h"
+#endif
 #elif defined(CORRADE_TARGET_WINDOWS)
 #include "Magnum/Platform/WindowlessWglApplication.h"
 #else

src/Magnum/TextureTools/distancefieldconverter.cpp

@@ -43,7 +43,11 @@
 #elif defined(CORRADE_TARGET_APPLE)
 #include "Magnum/Platform/WindowlessCglApplication.h"
 #elif defined(CORRADE_TARGET_UNIX)
+#if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_DESKTOP_GLES)
+#include "Magnum/Platform/WindowlessEglApplication.h"
+#else
 #include "Magnum/Platform/WindowlessGlxApplication.h"
+#endif
 #elif defined(CORRADE_TARGET_WINDOWS)
 #include "Magnum/Platform/WindowlessWglApplication.h"
 #else