test: Reuse PTINC in nptl tests

Use toplevel Rules.mak notion of PTINC as list of includes to use for
the testcases.

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

test/nptl/Makefile.in

@@ -73,21 +73,11 @@ else
 GLIBC_TESTS_DISABLED += tst-tls3_glibc tst-tls4_glibc tst-tls5_glibc
 endif
 
-PTDIR := $(top_builddir)libpthread/nptl
-SYSDEPS_DIR := $(top_srcdir)libc/sysdeps
-
 EXTRA_CFLAGS := -DNOT_IN_libc=1 -D_LIBC -D__USE_GNU -std=gnu99 \
-	-I$(SYSDEPS_DIR)/linux \
-	-I$(SYSDEPS_DIR)/linux/$(TARGET_ARCH) \
-	-I$(PTDIR) -I$(PTDIR)/sysdeps/unix/sysv/linux/$(TARGET_ARCH)	\
-	-I$(PTDIR)/sysdeps/$(TARGET_ARCH)				\
-	-I$(PTDIR)/sysdeps/unix/sysv/linux				\
-	-I$(PTDIR)/sysdeps/pthread					\
-	-I$(PTDIR)/sysdeps/pthread/bits					\
-	-I$(PTDIR)/sysdeps/generic					\
-	-I$(top_builddir)ldso/include					\
-	-I$(top_builddir)ldso/ldso/$(TARGET_ARCH)			\
-	-I$(top_builddir)include					\
+	$(PTINC) \
+	-I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH) \
+	-I$(top_srcdir)libc/sysdeps/linux \
+	-I$(top_builddir)include \
 	-include $(top_builddir)include/libc-symbols.h
 
 ifeq ($(TARGET_ARCH),i386)