FROMLIST: tests: Use -pthread in CFLAGS instead of -lpthread

-lpthread is not always a valid flag to pull pthread support, especially
on Android it will fail to link due to a missing libpthread.so. The more
generic way to build-in pthread support is to use the -pthread CFLAG, so
let's use it instead.

(am from https://patchwork.freedesktop.org/patch/135650/)

BUG=b:26864637
TEST=emerge-samus arc-libdrm

Change-Id: Iec375f66a666a056e1cba79272e7b621d96637cd
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/422809
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/tests/exynos/Makefile.am b/tests/exynos/Makefile.am
index 357d6b8..b636172 100644
--- a/tests/exynos/Makefile.am
+++ b/tests/exynos/Makefile.am
@@ -1,4 +1,5 @@
 AM_CFLAGS = \
+	-pthread \
 	$(WARN_CFLAGS)\
 	-I $(top_srcdir)/include/drm \
 	-I $(top_srcdir)/libkms/ \
@@ -34,8 +35,7 @@
 
 exynos_fimg2d_event_LDADD = \
 	$(top_builddir)/libdrm.la \
-	$(top_builddir)/exynos/libdrm_exynos.la \
-	-lpthread
+	$(top_builddir)/exynos/libdrm_exynos.la
 
 exynos_fimg2d_test_LDADD = \
 	$(top_builddir)/libdrm.la \
diff --git a/tests/modetest/Makefile.am b/tests/modetest/Makefile.am
index 9686ccb..4b296c8 100644
--- a/tests/modetest/Makefile.am
+++ b/tests/modetest/Makefile.am
@@ -3,6 +3,7 @@
 AM_CFLAGS = $(filter-out -Wpointer-arith, $(WARN_CFLAGS))
 
 AM_CFLAGS += \
+	-pthread \
 	-I$(top_srcdir)/include/drm \
 	-I$(top_srcdir)/tests \
 	-I$(top_srcdir)
@@ -20,5 +21,4 @@
 modetest_LDADD = \
 	$(top_builddir)/libdrm.la \
 	$(top_builddir)/tests/util/libutil.la \
-	$(CAIRO_LIBS) \
-	-lpthread
+	$(CAIRO_LIBS)
diff --git a/tests/nouveau/Makefile.am b/tests/nouveau/Makefile.am
index c4f6e29..593acef 100644
--- a/tests/nouveau/Makefile.am
+++ b/tests/nouveau/Makefile.am
@@ -1,4 +1,5 @@
 AM_CPPFLAGS = \
+	-pthread \
 	-I$(top_srcdir)/include/drm \
 	-I$(top_srcdir)/nouveau \
 	-I$(top_srcdir)
@@ -8,7 +9,7 @@
 LDADD = \
 	../../nouveau/libdrm_nouveau.la \
 	../../libdrm.la \
-	-ldl -lpthread
+	-ldl
 
 TESTS = threaded