r300g: Fix path to test programs for out-of-tree builds

Fixes make check in that case.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

src/gallium/drivers/r300/Makefile.am

@@ -22,6 +22,7 @@ r300_compiler_tests_LDADD = libr300.la libr300-helper.la \
 	$(top_builddir)/src/util/libmesautil.la \
 	$(GALLIUM_COMMON_LIB_DEPS)
 r300_compiler_tests_CPPFLAGS = \
+	-DTEST_PATH=\"$(top_srcdir)/src/gallium/drivers/r300/compiler/tests\" \
 	-I$(top_srcdir)/src/gallium/drivers/r300/compiler
 r300_compiler_tests_SOURCES = $(COMPILER_TESTS_SOURCES)
 

src/gallium/drivers/r300/compiler/tests/rc_test_helpers.c

@@ -543,7 +543,7 @@ unsigned load_program(
 	unsigned i = 0;
 
 	memset(line, 0, sizeof(line));
-	snprintf(path, MAX_PATH_LENGTH, "compiler/tests/%s", filename);
+	snprintf(path, MAX_PATH_LENGTH, TEST_PATH "/%s", filename);
 	file = fopen(path, "r");
 	if (!file) {
 		return 0;