dwmapi: Add dwmapi.h and update win32.api to fix the winapi_check warnings.

dlls/dwmapi/dwmapi_main.c

diff --git a/dlls/dwmapi/dwmapi_main.c b/dlls/dwmapi/dwmapi_main.c
index e4ebc3c..009f194 100644
--- a/dlls/dwmapi/dwmapi_main.c
+++ b/dlls/dwmapi/dwmapi_main.c
@@ -29,6 +29,7 @@
 #include "winbase.h"
 #include "wingdi.h"
 #include "winuser.h"
+#include "dwmapi.h"
 #include "wine/debug.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(dwmapi);

include/Makefile.in

diff --git a/include/Makefile.in b/include/Makefile.in
index 07daf60..889cd9c 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -152,6 +152,7 @@
 	dshow.h \
 	dsound.h \
 	dsrole.h \
+	dwmapi.h \
 	dxdiag.h \
 	dxerr8.h \
 	dxerr9.h \

include/dwmapi.h

diff --git a/include/dwmapi.h b/include/dwmapi.h
new file mode 100644
index 0000000..b2a28b6
--- /dev/null
+++ b/include/dwmapi.h
@@ -0,0 +1,39 @@
+/*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifndef __WINE_DWMAPI_H
+#define __WINE_DWMAPI_H
+
+#include "wtypes.h"
+#include "uxtheme.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef DWMAPI
+# define DWMAPI        STDAPI
+# define DWMAPI_(type) STDAPI_(type)
+#endif
+
+DWMAPI DwmEnableComposition(UINT);
+DWMAPI DwmIsCompositionEnabled(BOOL*);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* __WINE_DWMAPI_H */

tools/winapi/win32.api

diff --git a/tools/winapi/win32.api b/tools/winapi/win32.api
index c1e4003..1a7278c 100644
--- a/tools/winapi/win32.api
+++ b/tools/winapi/win32.api
@@ -1306,6 +1306,16 @@
 REFCLSID
 REFIID
 
+%%dwmapi.dll
+
+%long
+
+HRESULT
+
+%ptr
+
+BOOL *
+
 %%dxdiagn.dll
 
 %ptr