selftests/futex: pass _GNU_SOURCE without a value to the compiler

It's slightly better to set _GNU_SOURCE in the source code, but if one
must do it via the compiler invocation, then the best way to do so is
this:

$(CC) -D_GNU_SOURCE=

...because otherwise, if this form is used:

$(CC) -D_GNU_SOURCE

...then that leads the compiler to set a value, as if you had passed in:

$(CC) -D_GNU_SOURCE=1

That, in turn, leads to warnings under both gcc and clang, like this:

futex_requeue_pi.c:20: warning: "_GNU_SOURCE" redefined

Fix this by using the "-D_GNU_SOURCE=" form.

Reviewed-by: Edward Liaw <[e-mail]>
Reviewed-by: Davidlohr Bueso <[e-mail]>
Signed-off-by: John Hubbard <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/futex/functional/Makefile

···
 # SPDX-License-Identifier: GPL-2.0
 INCLUDES := -I../include -I../../ $(KHDR_INCLUDES)
-CFLAGS := $(CFLAGS) -g -O2 -Wall -D_GNU_SOURCE -pthread $(INCLUDES) $(KHDR_INCLUDES)
+CFLAGS := $(CFLAGS) -g -O2 -Wall -D_GNU_SOURCE= -pthread $(INCLUDES) $(KHDR_INCLUDES)
 LDLIBS := -lpthread -lrt
 
 LOCAL_HDRS := \