Add CLEANFILES to relevant Makefile.am to force removal of Windows EXEs.

This ensures they are removed even we've cross-compiled from Linux
to Windows and then configured for Linux. We don't want the Windows
EXEs to be run after configuring for Linux.

src/flac/Makefile.am

@@ -53,3 +53,5 @@ flac_LDADD = \
 	@OGG_LIBS@ \
 	@LIBICONV@ \
 	-lm
+
+CLEANFILES = flac.exe

src/metaflac/Makefile.am

@@ -50,3 +50,5 @@ metaflac_LDADD = \
 	@OGG_LIBS@ \
 	@LIBICONV@ \
 	-lm
+
+CLEANFILES = metaflac.exe

src/test_grabbag/cuesheet/Makefile.am

@@ -29,3 +29,5 @@ test_cuesheet_LDADD = \
 	$(top_builddir)/src/libFLAC/libFLAC.la \
 	@OGG_LIBS@ \
 	-lm
+
+CLEANFILES = test_cuesheet.exe

src/test_grabbag/picture/Makefile.am

@@ -29,3 +29,5 @@ test_picture_LDADD = \
 	$(top_builddir)/src/libFLAC/libFLAC.la \
 	@OGG_LIBS@ \
 	-lm
+
+CLEANFILES = test_picture.exe

src/test_libFLAC++/Makefile.am

@@ -40,3 +40,5 @@ test_libFLAC___SOURCES = \
 	decoders.h \
 	encoders.h \
 	metadata.h
+
+CLEANFILES = test_libFLAC++.exe

src/test_libFLAC/Makefile.am

@@ -44,3 +44,5 @@ test_libFLAC_SOURCES = \
 	encoders.h \
 	format.h \
 	metadata.h
+
+CLEANFILES = test_libFLAC.exe

src/test_seeking/Makefile.am

@@ -31,3 +31,5 @@ test_seeking_LDADD = \
 
 test_seeking_SOURCES = \
 	main.c
+
+CLEANFILES = test_seeking.exe

src/test_streams/Makefile.am

@@ -25,3 +25,5 @@ test_streams_SOURCES = \
 	main.c
 
 test_streams_LDADD =  $(top_builddir)/src/share/grabbag/libgrabbag.la -lm
+
+CLEANFILES = test_streams.exe