Move source files used in utils/mingw/ into that subdirectory

Move all the source files used in utils/mingw/ into that subdirectory,
so the built objects are in the expected place.

(path.cc requires some more unpicking, and even then there is genuinely
some shared code, so use a trivial file which includes the real path.cc
so the object file is generated where expected)

winsup/utils/mingw/Makefile.am

@@ -25,26 +25,29 @@ bin_PROGRAMS = \
 	strace
 
 cygcheck_SOURCES = \
-	../bloda.cc \
-	../cygcheck.cc \
-	../dump_setup.cc \
-	../path.cc
+	bloda.cc \
+	cygcheck.cc \
+	dump_setup.cc \
+	path.cc
+cygcheck_CPPFLAGS=-I$(srcdir)/..
 cygcheck_LDADD = -lz -lwininet -lpsapi -lntdll
 
-cygwin_console_helper_SOURCES = ../cygwin-console-helper.cc
+cygwin_console_helper_SOURCES = cygwin-console-helper.cc
 
-ldh_SOURCES = ../ldh.cc
+ldh_SOURCES = ldh.cc
 
 strace_SOURCES = \
-	../path.cc \
-	../strace.cc
+	path.cc \
+	strace.cc
+strace_CPPFLAGS=-I$(srcdir)/..
 strace_LDADD = -lntdll
 
 noinst_PROGRAMS = path-testsuite
 
 path_testsuite_SOURCES = \
-	../path.cc \
-	../testsuite.cc
+	path.cc \
+	testsuite.cc
+path_testsuite_CPPFLAGS=-I$(srcdir)/..
 path_testsuite_CXXFLAGS = -DTESTSUITE
 
 TESTS = path-testsuite

winsup/utils/mingw/path.cc

@@ -0,0 +1 @@
+#include "../path.cc"

winsup/utils/mingw/strace.cc

@@ -21,11 +21,11 @@ details. */
 #include <time.h>
 #include <signal.h>
 #include <errno.h>
-#include "../cygwin/include/sys/strace.h"
-#include "../cygwin/include/sys/cygwin.h"
-#include "../cygwin/include/cygwin/version.h"
-#include "../cygwin/cygtls_padsize.h"
-#include "../cygwin/gcc_seh.h"
+#include "../../cygwin/include/sys/strace.h"
+#include "../../cygwin/include/sys/cygwin.h"
+#include "../../cygwin/include/cygwin/version.h"
+#include "../../cygwin/cygtls_padsize.h"
+#include "../../cygwin/gcc_seh.h"
 #include "path.h"
 #undef cygwin_internal
 #include "loadlib.h"