tests: fix make check for out-of-tree builds

It was failing with missing include files.

While here, destroy the ugly "../src/..." include
paths used in the tests that was just hacking around
this problem in the Makefile:

sed -i s/..\\/src\\/// tests/*.c

tests/Makefile.am

@@ -34,7 +34,8 @@ os_wrappers_test_SOURCES = 			\
 	../src/wayland-os.c			\
 	$(test_runner_src)
 
-AM_CFLAGS = $(GCC_CFLAGS) $(FFI_CFLAGS) -I../src
+AM_CPPFLAGS = -I$(top_builddir)/src -I$(top_srcdir)/src
+AM_CFLAGS = $(GCC_CFLAGS) $(FFI_CFLAGS)
 LDADD = $(top_builddir)/src/libwayland-util.la \
 	$(top_builddir)/src/libwayland-server.la \
 	-lrt -ldl $(FFI_LIBS)

tests/array-test.c

@@ -22,7 +22,7 @@
 
 #include <stdlib.h>
 #include <assert.h>
-#include "../src/wayland-private.h"
+#include "wayland-private.h"
 #include "test-runner.h"
 
 TEST(array_init)

tests/client-test.c

@@ -31,7 +31,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
-#include "../src/wayland-server.h"
+#include "wayland-server.h"
 #include "test-runner.h"
 
 struct client_destroy_listener {

tests/connection-test.c

@@ -32,7 +32,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 
-#include "../src/wayland-private.h"
+#include "wayland-private.h"
 #include "test-runner.h"
 
 static const char message[] = "Hello, world";

tests/event-loop-test.c

@@ -24,7 +24,7 @@
 #include <assert.h>
 #include <unistd.h>
 #include <signal.h>
-#include "../src/wayland-server.h"
+#include "wayland-server.h"
 #include "test-runner.h"
 
 static int

tests/fixed-benchmark.c

@@ -25,7 +25,7 @@
 #include <string.h>
 #include <time.h>
 #include <assert.h>
-#include "../src/wayland-private.h"
+#include "wayland-private.h"
 
 volatile double global_d;
 

tests/fixed-test.c

@@ -23,7 +23,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <assert.h>
-#include "../src/wayland-private.h"
+#include "wayland-private.h"
 #include "test-runner.h"
 
 TEST(fixed_double_conversions)

tests/list-test.c

@@ -23,7 +23,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
-#include "../src/wayland-private.h"
+#include "wayland-private.h"
 #include "test-runner.h"
 
 TEST(list_init)

tests/map-test.c

@@ -23,7 +23,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
-#include "../src/wayland-private.h"
+#include "wayland-private.h"
 #include "test-runner.h"
 
 TEST(map_insert_new)

tests/os-wrappers-test.c

@@ -36,9 +36,9 @@
 #include <stdio.h>
 #include <sys/epoll.h>
 
-#include "../src/wayland-private.h"
+#include "wayland-private.h"
 #include "test-runner.h"
-#include "../src/wayland-os.h"
+#include "wayland-os.h"
 
 static int fall_back;
 

tests/sanity-test.c

@@ -27,7 +27,7 @@
 #include <unistd.h>
 
 #include "test-runner.h"
-#include "../src/wayland-util.h"
+#include "wayland-util.h"
 
 TEST(empty)
 {