rasapi32: Fix building the tests with MSVC (based on a patch by Reece Dunn).
diff --git a/include/Makefile.in b/include/Makefile.in
index 99b06d9..882d89d 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -350,6 +350,7 @@
 	pshpack4.h \
 	pshpack8.h \
 	ras.h \
+	raserror.h \
 	reason.h \
 	regstr.h \
 	richedit.h \