build: Add QMacStyle support

Author: hebasto

build-aux/m4/bitcoin_qt.m4

@@ -123,7 +123,7 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
     _BITCOIN_QT_CHECK_STATIC_LIBS
 
     if test "x$qt_plugin_path" != x; then
-      QT_LIBS="$QT_LIBS -L$qt_plugin_path/platforms"
+      QT_LIBS="$QT_LIBS -L$qt_plugin_path/platforms -L$qt_plugin_path/styles"
       if test -d "$qt_plugin_path/accessible"; then
         QT_LIBS="$QT_LIBS -L$qt_plugin_path/accessible"
       fi
@@ -154,6 +154,7 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
       AX_CHECK_LINK_FLAG([[-framework Metal]],[QT_LIBS="$QT_LIBS -framework Metal"],[AC_MSG_ERROR(could not link against Metal framework)])
       AX_CHECK_LINK_FLAG([[-framework QuartzCore]],[QT_LIBS="$QT_LIBS -framework QuartzCore"],[AC_MSG_ERROR(could not link against QuartzCore framework)])
       _BITCOIN_QT_CHECK_STATIC_PLUGIN([QCocoaIntegrationPlugin], [-lqcocoa])
+      _BITCOIN_QT_CHECK_STATIC_PLUGIN([QMacStylePlugin], [-lqmacstyle])
       AC_DEFINE(QT_QPA_PLATFORM_COCOA, 1, [Define this symbol if the qt platform is cocoa])
     elif test "x$TARGET_OS" = xandroid; then
       QT_LIBS="-Wl,--export-dynamic,--undefined=JNI_OnLoad -lqtforandroid -ljnigraphics -landroid -lqtfreetype -lQt5EglSupport $QT_LIBS"

src/qt/bitcoin.cpp

@@ -62,6 +62,7 @@ Q_IMPORT_PLUGIN(QXcbIntegrationPlugin);
 Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);
 #elif defined(QT_QPA_PLATFORM_COCOA)
 Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin);
+Q_IMPORT_PLUGIN(QMacStylePlugin);
 #endif
 #endif