Fix no-opengl build with egl

Disable eglfs and similar plugins when opengl is not enabled.
(but egl is present)

GL-dependent parts of eglconvenience need to be skipped too.

Task-number: QTBUG-37457
Change-Id: I44d49495241551bc7b1f565aa0b5ace9f310628e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

configure

@@ -5411,7 +5411,7 @@ if [ "$CFG_EGL" != "no" ]; then
 fi
 
 if [ "$CFG_EGLFS" != "no" ]; then
-    if [ "$XPLATFORM_QNX" = "no" ]; then
+    if [ "$XPLATFORM_QNX" = "no" ] && [ "$CFG_OPENGL" != "no" ]; then
         CFG_EGLFS="$CFG_EGL"
     else
         CFG_EGLFS="no"

src/platformsupport/eglconvenience/eglconvenience.pri

@@ -1,30 +1,33 @@
 contains(QT_CONFIG,egl) {
     HEADERS += \
         $$PWD/qeglconvenience_p.h \
-        $$PWD/qeglplatformcontext_p.h \
         $$PWD/qeglpbuffer_p.h
 
     SOURCES += \
         $$PWD/qeglconvenience.cpp \
-        $$PWD/qeglplatformcontext.cpp \
         $$PWD/qeglpbuffer.cpp
 
-    unix {
-        HEADERS += \
-            $$PWD/qeglplatformcursor_p.h \
-            $$PWD/qeglplatformwindow_p.h \
-            $$PWD/qeglplatformscreen_p.h \
-            $$PWD/qeglcompositor_p.h \
-            $$PWD/qeglplatformbackingstore_p.h \
-            $$PWD/qeglplatformintegration_p.h
+    contains(QT_CONFIG,opengl) {
+        HEADERS += $$PWD/qeglplatformcontext_p.h
+        SOURCES += $$PWD/qeglplatformcontext.cpp
 
-        SOURCES += \
-            $$PWD/qeglplatformcursor.cpp \
-            $$PWD/qeglplatformwindow.cpp \
-            $$PWD/qeglplatformscreen.cpp \
-            $$PWD/qeglcompositor.cpp \
-            $$PWD/qeglplatformbackingstore.cpp \
-            $$PWD/qeglplatformintegration.cpp
+        unix {
+            HEADERS += \
+                $$PWD/qeglplatformcursor_p.h \
+                $$PWD/qeglplatformwindow_p.h \
+                $$PWD/qeglplatformscreen_p.h \
+                $$PWD/qeglcompositor_p.h \
+                $$PWD/qeglplatformbackingstore_p.h \
+                $$PWD/qeglplatformintegration_p.h
+
+            SOURCES += \
+                $$PWD/qeglplatformcursor.cpp \
+                $$PWD/qeglplatformwindow.cpp \
+                $$PWD/qeglplatformscreen.cpp \
+                $$PWD/qeglcompositor.cpp \
+                $$PWD/qeglplatformbackingstore.cpp \
+                $$PWD/qeglplatformintegration.cpp
+        }
     }
 
     # Avoid X11 header collision