tests/tcg: Fix compilation of test_path

The test_path binary is (unlike the other test binaries in tests/tcg)
actually intended to be compiled with the same compiler used to build
the main QEMU executables. It actually #includes a number of the
QEMU source files in an attempt to unit-test the util/path.c functions,
and so if it is not compiled with the same compiler used by configure
to set CONFIG_ settings then it is liable to fail to build.
Fix the makefile to build it with the default C compiler rules, not
CC_I386, and fix the test itself not to include a lot of unnecessary
trace related source files which cause the build to fail if the trace
backend is anything other than 'simple'.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

tests/tcg/Makefile

@@ -81,10 +81,8 @@ run-test_path: test_path
 # rules to compile tests
 
 test_path: test_path.o
-	$(CC_I386) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 test_path.o: test_path.c
-	$(CC_I386) $(QEMU_INCLUDES) $(GLIB_CFLAGS) $(CFLAGS) -c -o $@ $^
 
 hello-i386: hello-i386.c
 	$(CC_I386) -nostdlib $(CFLAGS) -static $(LDFLAGS) -o $@ $<

tests/tcg/test_path.c

 /* Test path override code */
-#define _GNU_SOURCE
 #include "config-host.h"
 #include "util/cutils.c"
 #include "util/hexdump.c"
 #include "util/iov.c"
 #include "util/path.c"
 #include "util/qemu-timer-common.c"
-#include "trace/control.c"
-#include "../trace/generated-events.c"
-#ifdef CONFIG_TRACE_SIMPLE
-#include "trace/simple.c"
-#endif
-
 #include <stdarg.h>
 #include <sys/stat.h>
 #include <fcntl.h>