Fix errors in linker output when building ARM64EC (#19331)

Summary of the issue:

When building NVDA with Visual Studio 2026, errors are printed when linking ARm64EC:

build\arm64ec\local\nvdaHelperLocal.def : error LNK1397: '?_nvdaController_speakText@@3P6AKPEB_W@ZEA' is an invalid name for a function export, treating it as a data export. (Did you forget 'DATA' in the .def file?)
build\arm64ec\local\nvdaHelperLocal.def : error LNK1397: '?_nvdaControllerInternal_handleRemoteURL@@3P6AKPEB_W@ZEA' is an invalid name for a function export, treating it as a data export. (Did you forget 'DATA' in the .def file?)
build\arm64ec\local\nvdaHelperLocal.def : error LNK1397: '?_nvdaControllerInternal_reportLiveRegion@@3P6AKPEB_W0@ZEA' is an invalid name for a function export, treating it as a data export. (Did you forget 'DATA' in the .def file?)
build\arm64ec\local\nvdaHelperLocal.def : error LNK1397: '?_nvdaController_cancelSpeech@@3P6AKXZEA' is an invalid name for a function export, treating it as a data export. (Did you forget 'DATA' in the .def file?)
build\arm64ec\local\nvdaHelperLocal.def : error LNK1397: '?_nvdaControllerInternal_inputCompositionUpdate@@3P6AKPEB_WHHH@ZEA' is an invalid name for a function export, treating it as a data export. (Did you forget 'DATA' in the .def file?)
build\arm64ec\local\nvdaHelperLocal.def : error LNK1397: '?_nvdaControllerInternal_inputConversionModeUpdate@@3P6AKJJK@ZEA' is an invalid name for a function export, treating it as a data export. (Did you forget 'DATA' in the .def file?)

Description of user facing changes:

None
Description of developer facing changes:

No longer errors when building NVDA.
Description of development approach:

Do as the linker suggests, explicitly mark non-function exports with the DATA keyword

Author: LeonarddeR

nvdaHelper/local/nvdaHelperLocal.def

@@ -1,8 +1,8 @@
 EXPORTS
 	createRemoteBindingHandle
 	cancellableSendMessageTimeout
-	cancelCallEvent
-	_notifySendMessageCancelled
+	cancelCallEvent DATA
+	_notifySendMessageCancelled DATA
 	nvdaHelperLocal_initialize
 	nvdaHelperLocal_terminate
 	generateBeep
@@ -36,24 +36,24 @@ EXPORTS
 	VBuf_locateControlFieldNodeAtOffset
 	VBuf_locateTextFieldNodeAtOffset
 	VBuf_setSelectionOffsets
-	_nvdaControllerInternal_requestRegistration
-	_nvdaControllerInternal_displayModelTextChangeNotify
-	_nvdaControllerInternal_inputLangChangeNotify
-	_nvdaControllerInternal_inputCompositionUpdate
-	_nvdaControllerInternal_inputCandidateListUpdate
-	_nvdaControllerInternal_IMEOpenStatusUpdate
-	_nvdaControllerInternal_inputConversionModeUpdate
-	_nvdaControllerInternal_logMessage
-	_nvdaControllerInternal_typedCharacterNotify
-	_nvdaControllerInternal_installAddonPackageFromPath
-	_nvdaControllerInternal_handleRemoteURL
-	_nvdaControllerInternal_drawFocusRectNotify
-	_nvdaController_brailleMessage
-	_nvdaController_cancelSpeech
-	_nvdaController_speakText
-	_nvdaController_speakSsml
+	_nvdaControllerInternal_requestRegistration DATA
+	_nvdaControllerInternal_displayModelTextChangeNotify DATA
+	_nvdaControllerInternal_inputLangChangeNotify DATA
+	_nvdaControllerInternal_inputCompositionUpdate DATA
+	_nvdaControllerInternal_inputCandidateListUpdate DATA
+	_nvdaControllerInternal_IMEOpenStatusUpdate DATA
+	_nvdaControllerInternal_inputConversionModeUpdate DATA
+	_nvdaControllerInternal_logMessage DATA
+	_nvdaControllerInternal_typedCharacterNotify DATA
+	_nvdaControllerInternal_installAddonPackageFromPath DATA
+	_nvdaControllerInternal_handleRemoteURL DATA
+	_nvdaControllerInternal_drawFocusRectNotify DATA
+	_nvdaController_brailleMessage DATA
+	_nvdaController_cancelSpeech DATA
+	_nvdaController_speakText DATA
+	_nvdaController_speakSsml DATA
 	nvdaController_onSsmlMarkReached
-	_nvdaControllerInternal_vbufChangeNotify
+	_nvdaControllerInternal_vbufChangeNotify DATA
 	displayModel_getWindowTextInRect
 	displayModel_getFocusRect
 	displayModel_getCaretRect
@@ -70,8 +70,8 @@ EXPORTS
 	logMessage
 	getOleClipboardText
 	getOleUserType
-	_nvdaControllerInternal_reportLiveRegion
-	_nvdaControllerInternal_openConfigDirectory
+	_nvdaControllerInternal_reportLiveRegion DATA
+	_nvdaControllerInternal_openConfigDirectory DATA
 	rateLimitedUIAEventHandler_create
 	rateLimitedUIAEventHandler_terminate
 	wasPlay_create