Fixed compiler warnings for EglContext.

X11 macros are a mess with a lot of C-style casts, disabled the warnings
for this file. Also anonymized unused constructor parameters.

src/Contexts/CMakeLists.txt

@@ -31,6 +31,8 @@ if(WITH_EGLCONTEXT)
     find_package(X11)
     if(EGL_FOUND AND X11_FOUND)
         add_library(MagnumEglContext STATIC EglContext.cpp)
+        # X11 macros are a mess, disable warnings for C-style casts
+        set_target_properties(MagnumEglContext PROPERTIES COMPILE_FLAGS "-Wno-old-style-cast")
         install(FILES EglContext.h DESTINATION ${MAGNUM_INCLUDE_INSTALL_DIR}/Contexts)
         install(TARGETS MagnumEglContext DESTINATION ${MAGNUM_LIBRARY_INSTALL_DIR})
     else()

src/Contexts/EglContext.cpp

@@ -21,7 +21,7 @@ using namespace std;
 
 namespace Magnum { namespace Contexts {
 
-EglContext::EglContext(int& argc, char** argv, const string& title, const Math::Vector2<GLsizei>& size): viewportSize(size) {
+EglContext::EglContext(int&, char**, const string& title, const Math::Vector2<GLsizei>& size): viewportSize(size) {
     /* Get default X display and root window, init EGL */
     xDisplay = XOpenDisplay(0);
     display = eglGetDisplay(xDisplay);