build: set QT_*_CFLAGS & QT_*_LIBS in PKG_CHECK_MODULES() calls

build-aux/m4/bitcoin_qt.m4

@@ -361,23 +361,21 @@ dnl Outputs: All necessary QT_* variables are set.
 dnl Outputs: have_qt_test and have_qt_dbus are set (if applicable) to yes|no.
 AC_DEFUN([_BITCOIN_QT_FIND_LIBS],[
   BITCOIN_QT_CHECK([
-    PKG_CHECK_MODULES([QT_CORE], [${qt_lib_prefix}Core${qt_lib_suffix} $qt_version], [],
+    PKG_CHECK_MODULES([QT_CORE], [${qt_lib_prefix}Core${qt_lib_suffix} $qt_version], [QT_INCLUDES="$QT_CORE_CFLAGS $QT_INCLUDES" QT_LIBS="$QT_CORE_LIBS $QT_LIBS"],
                       [BITCOIN_QT_FAIL([${qt_lib_prefix}Core${qt_lib_suffix} $qt_version not found])])
   ])
   BITCOIN_QT_CHECK([
-    PKG_CHECK_MODULES([QT_GUI], [${qt_lib_prefix}Gui${qt_lib_suffix} $qt_version], [],
+    PKG_CHECK_MODULES([QT_GUI], [${qt_lib_prefix}Gui${qt_lib_suffix} $qt_version], [QT_INCLUDES="$QT_GUI_CFLAGS $QT_INCLUDES" QT_LIBS="$QT_GUI_LIBS $QT_LIBS"],
                       [BITCOIN_QT_FAIL([${qt_lib_prefix}Gui${qt_lib_suffix} $qt_version not found])])
   ])
   BITCOIN_QT_CHECK([
-    PKG_CHECK_MODULES([QT_WIDGETS], [${qt_lib_prefix}Widgets${qt_lib_suffix} $qt_version], [],
+    PKG_CHECK_MODULES([QT_WIDGETS], [${qt_lib_prefix}Widgets${qt_lib_suffix} $qt_version], [QT_INCLUDES="$QT_WIDGETS_CFLAGS $QT_INCLUDES" QT_LIBS="$QT_WIDGETS_LIBS $QT_LIBS"],
                       [BITCOIN_QT_FAIL([${qt_lib_prefix}Widgets${qt_lib_suffix} $qt_version not found])])
   ])
   BITCOIN_QT_CHECK([
-    PKG_CHECK_MODULES([QT_NETWORK], [${qt_lib_prefix}Network${qt_lib_suffix} $qt_version], [],
+    PKG_CHECK_MODULES([QT_NETWORK], [${qt_lib_prefix}Network${qt_lib_suffix} $qt_version], [QT_INCLUDES="$QT_NETWORK_CFLAGS $QT_INCLUDES" QT_LIBS="$QT_NETWORK_LIBS $QT_LIBS"],
                       [BITCOIN_QT_FAIL([${qt_lib_prefix}Network${qt_lib_suffix} $qt_version not found])])
   ])
-  QT_INCLUDES="$QT_CORE_CFLAGS $QT_GUI_CFLAGS $QT_WIDGETS_CFLAGS $QT_NETWORK_CFLAGS"
-  QT_LIBS="$QT_CORE_LIBS $QT_GUI_LIBS $QT_WIDGETS_LIBS $QT_NETWORK_LIBS"
 
   BITCOIN_QT_CHECK([
     PKG_CHECK_MODULES([QT_TEST], [${qt_lib_prefix}Test${qt_lib_suffix} $qt_version], [QT_TEST_INCLUDES="$QT_TEST_CFLAGS"; have_qt_test=yes], [have_qt_test=no])