Slim Qt5 and added mesa dependency

src/mesa-1-fixes.patch

@@ -0,0 +1,25 @@
+This file is part of MXE. See LICENSE.md for licensing information.
+
+Contains ad hoc patches for cross building.
+
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Robert Manner <robert.manner@balabit.com>
+Date: Fri, 15 Dec 2017 16:40:18 +0100
+Subject: [PATCH] scons/crossmingw.py: compiler prefix can be customized
+ through environment
+
+
+diff --git a/scons/crossmingw.py b/scons/crossmingw.py
+index 1111111..2222222 100644
+--- a/scons/crossmingw.py
++++ b/scons/crossmingw.py
+@@ -51,6 +51,9 @@ prefixes64 = SCons.Util.Split("""
+ """)
+
+ def find(env):
++    if os.environ['MINGW_PREFIX']:
++        return os.environ['MINGW_PREFIX']
++
+     if env['machine'] == 'x86_64':
+         prefixes = prefixes64
+     else:

src/mesa.mk

@@ -0,0 +1,30 @@
+PKG             := mesa
+$(PKG)_VERSION  := 18.3.6
+$(PKG)_CHECKSUM := aaf17638dcf5a90b93b6389e152fdc9ef147768b09598f24d2c5cf482fcfc705
+$(PKG)_SUBDIR   := mesa-$($(PKG)_VERSION)
+$(PKG)_FILE     := mesa-$($(PKG)_VERSION).tar.xz
+$(PKG)_URL      := ftp://ftp.freedesktop.org/pub/mesa/$($(PKG)_FILE)
+$(PKG)_DEPS     := gcc scons-local
+
+ifeq (,$(findstring x86_64,$(TARGET)))
+    MACHINE=x86_64
+else
+    MACHINE=x86
+endif
+
+define $(PKG)_BUILD
+    cd '$(1)' && \
+    MINGW_PREFIX='$(TARGET)-' scons \
+        platform=windows \
+        toolchain=crossmingw \
+        machine=$(MACHINE) \
+        verbose=1 \
+        build=release \
+        libgl-gdi
+
+    for i in EGL GLES GLES2 GLES3 KHR; do \
+        $(INSTALL) -d "$(PREFIX)/$(TARGET)/include/$$i"; \
+        $(INSTALL) -m 644 "$(1)/include/$$i/"* "$(PREFIX)/$(TARGET)/include/$$i/"; \
+    done
+    $(INSTALL) -m 755 '$(1)/build/windows-$(MACHINE)/gallium/targets/libgl-gdi/opengl32.dll' '$(PREFIX)/$(TARGET)/bin/'
+endef

src/qtbase.mk

@@ -9,7 +9,7 @@ $(PKG)_CHECKSUM := 9e7af10aece15fa9500369efde69cb220eee8ec3a6818afe01ce1e7d48482
 $(PKG)_SUBDIR   := $(PKG)-everywhere-src-$($(PKG)_VERSION)
 $(PKG)_FILE     := $(PKG)-everywhere-src-$($(PKG)_VERSION).tar.xz
 $(PKG)_URL      := https://download.qt.io/official_releases/qt/5.15/$($(PKG)_VERSION)/submodules/$($(PKG)_FILE)
-$(PKG)_DEPS     := cc dbus fontconfig freetds freetype harfbuzz jpeg libmysqlclient libpng openssl pcre2 postgresql sqlite zlib zstd $(BUILD)~zstd
+$(PKG)_DEPS     := cc dbus fontconfig freetds freetype harfbuzz jpeg libmysqlclient libpng mesa openssl pcre2 postgresql sqlite zlib zstd $(BUILD)~zstd
 $(PKG)_DEPS_$(BUILD) :=
 $(PKG)_TARGETS  := $(BUILD) $(MXE_TARGETS)
 
@@ -44,17 +44,40 @@ define $(PKG)_BUILD
             $(if $(BUILD_STATIC), -static,)$(if $(BUILD_SHARED), -shared,) \
             -prefix '$(PREFIX)/$(TARGET)/qt5' \
             -no-icu \
-            -opengl desktop \
+            -opengl dynamic \
             -no-glib \
             -accessibility \
             -nomake examples \
             -nomake tests \
-            -plugin-sql-mysql \
-            -mysql_config $(PREFIX)/$(TARGET)/bin/mysql_config \
-            -plugin-sql-sqlite \
-            -plugin-sql-odbc \
-            -plugin-sql-psql \
-            -plugin-sql-tds -D Q_USE_SYBASE \
+            -skip qtlocation \
+            -skip qtsensors \
+            -skip qtwayland \
+            -skip qtgamepad \
+            -skip qtserialbus \
+            -skip qtquickcontrols \
+            -skip qtquickcontrols2 \
+            -skip qtspeech \
+            -skip qtserialport \
+            -skip qtandroidextras \
+            -skip qtpurchasing \
+            -skip qtwebview \
+            -skip qtscript \
+            -skip qtvirtualkeyboard \
+            -skip qtcharts \
+            -skip qtwebchannel \
+            -skip qtwebengine \
+            -skip qt3d \
+            -skip qtcanvas3d \
+            -optimize-size \
+            -no-feature-cups \
+            -no-feature-ftp \
+            -no-feature-pdf \
+            -no-feature-animation \
+            -skip qtdeclarative \
+            -skip qtwebkit \
+            -skip qtwebkit-examples \
+            -skip qtmultimedia \
+            -skip qtquick1 \
             -system-zlib \
             -system-libpng \
             -system-libjpeg \
@@ -114,6 +137,7 @@ define $(PKG)_BUILD_$(BUILD)
         -static \
         -release \
         -opensource \
+        -no-opengl \
         -confirm-license \
         -no-dbus \
         -no-{eventfd,glib,icu,openssl} \