[PATCH] selftests: use $(MAKE) instead of "make"

[Paolo Bonzini]

This avoids a warning:

    make[1]: warning: jobserver unavailable: using -j1.  Add `+' to parent make rule.

Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
 tools/testing/selftests/lib.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index 1c8a1963d03f..99c25dcbdfb0 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -47,9 +47,9 @@ ARCH		?= $(SUBARCH)
 khdr:
 ifndef KSFT_KHDR_INSTALL_DONE
 ifeq (1,$(DEFAULT_INSTALL_HDR_PATH))
-	make --no-builtin-rules ARCH=$(ARCH) -C $(top_srcdir) headers_install
+	$(MAKE) --no-builtin-rules ARCH=$(ARCH) -C $(top_srcdir) headers_install
 else
-	make --no-builtin-rules INSTALL_HDR_PATH=$$OUTPUT/usr \
+	$(MAKE) --no-builtin-rules INSTALL_HDR_PATH=$$OUTPUT/usr \
 		ARCH=$(ARCH) -C $(top_srcdir) headers_install
 endif
 endif
-- 
1.8.3.1