Remove fxc configure test

This was used for ANGLE, which was removed in 752497910b.

Change-Id: I29bad031b296fddc425145cd206a372baf650267
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/gui/configure.pri

@@ -19,43 +19,6 @@ defineTest(qtConfLibrary_freetype) {
     return(false)
 }
 
-# Check for Direct X shader compiler 'fxc'.
-# Up to Direct X SDK June 2010 and for MinGW, this is pointed to by the
-# DXSDK_DIR variable. Starting with Windows Kit 8, it is included in
-# the Windows SDK.
-defineTest(qtConfTest_fxc) {
-    !mingw {
-        fxc = $$qtConfFindInPath("fxc.exe")
-    } else {
-        equals(QMAKE_HOST.arch, x86_64): \
-            fns = x64/fxc.exe
-        else: \
-            fns = x86/fxc.exe
-        dxdir = $$(DXSDK_DIR)
-        !isEmpty(dxdir) {
-            fxc = $$dxdir/Utilities/bin/$$fns
-        } else {
-            winkitbindir = $$(WindowsSdkVerBinPath)
-            !isEmpty(winkitbindir) {
-                fxc = $$winkitbindir/$$fns
-            } else {
-                winkitdir = $$(WindowsSdkDir)
-                !isEmpty(winkitdir): \
-                    fxc = $$winkitdir/bin/$$fns
-            }
-        }
-    }
-
-    !isEmpty(fxc):exists($$fxc) {
-        $${1}.value = $$clean_path($$fxc)
-        export($${1}.value)
-        $${1}.cache += value
-        export($${1}.cache)
-        return(true)
-    }
-    return(false)
-}
-
 defineTest(qtConfTest_qpaDefaultPlatform) {
     name =
     !isEmpty(config.input.qpa_default_platform): name = $$config.input.qpa_default_platform