Allow to build custom Qt theme in Windows builds

source/theme/Makefile

@@ -10,15 +10,21 @@ include ../modules/Makefile.mk
 
 # ---------------------------------------------------------------------------------------------------------------------
 
+ifeq ($(WIN32),true)
+NON_STATIC_LINK_FLAGS = $(shell echo $(LINK_FLAGS) | awk 'sub(" -static","")')
+else
+NON_STATIC_LINK_FLAGS = $(LINK_FLAGS)
+endif
+
 ifeq ($(HAVE_QT4),true)
 QT4_CXX_FLAGS  = $(BUILD_CXX_FLAGS) $(shell pkg-config --cflags QtCore QtGui)
-QT4_LINK_FLAGS = $(LINK_FLAGS) $(shell pkg-config --libs QtCore QtGui)
+QT4_LINK_FLAGS = $(NON_STATIC_LINK_FLAGS) $(shell pkg-config --libs QtCore QtGui)
 QT4_STYLES_DIR = $(shell pkg-config --variable=libdir QtCore)/qt4/plugins/styles
 endif
 
 ifeq ($(HAVE_QT5),true)
 QT5_CXX_FLAGS  = $(BUILD_CXX_FLAGS) $(shell pkg-config --cflags Qt5Core Qt5Gui Qt5Widgets)
-QT5_LINK_FLAGS = $(LINK_FLAGS) $(shell pkg-config --libs Qt5Core Qt5Gui Qt5Widgets)
+QT5_LINK_FLAGS = $(NON_STATIC_LINK_FLAGS) $(shell pkg-config --libs Qt5Core Qt5Gui Qt5Widgets)
 QT5_STYLES_DIR = $(shell pkg-config --variable=libdir Qt5Core)/qt5/plugins/styles
 endif