wxp/mingw build fixes

bitcoin-qt.pro

@@ -14,6 +14,7 @@ windows:LIBS += -lssl -lcrypto -lboost_system-mgw44-mt-1_43 -lboost_filesystem-m
 
 # for extra security against potential buffer overflows
 QMAKE_CXXFLAGS += -fstack-protector 
+QMAKE_LFLAGS += -fstack-protector
 
 # disable quite some warnings because bitcoin core "sins" a lot
 QMAKE_CXXFLAGS_WARN_ON = -fdiagnostics-show-option -Wall -Wno-invalid-offsetof -Wno-unused-variable -Wno-unused-parameter -Wno-sign-compare -Wno-char-subscripts  -Wno-unused-value -Wno-sequence-point -Wno-parentheses -Wno-unknown-pragmas -Wno-switch

src/qt/bitcoin.cpp

@@ -125,6 +125,8 @@ int main(int argc, char *argv[])
                 window.setClientModel(&clientModel);
                 window.setWalletModel(&walletModel);
 
+                if (QtWin::isCompositionEnabled())
+                {
 #ifdef Q_WS_WIN32
                     // Windows-specific customization
                     window.setAttribute(Qt::WA_TranslucentBackground);
@@ -137,8 +139,6 @@ int main(int argc, char *argv[])
                     window.ensurePolished();
                     window.setAttribute(Qt::WA_StyledBackground, false);
 #endif
-                if (QtWin::isCompositionEnabled())
-                {
                     QtWin::extendFrameIntoClientArea(&window);
                     window.setContentsMargins(0, 0, 0, 0);
                 }