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.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
[Emil Velikov: rebase on top of previous commit]
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

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_perf_LDADD = \
 
 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 \

tests/modetest/Makefile.am

@@ -3,6 +3,7 @@ include Makefile.sources
 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_SOURCES = $(MODETEST_FILES)
 modetest_LDADD = \
 	$(top_builddir)/libdrm.la \
 	$(top_builddir)/tests/util/libutil.la \
-	$(CAIRO_LIBS) \
-	-lpthread
+	$(CAIRO_LIBS)

tests/nouveau/Makefile.am

@@ -1,4 +1,5 @@
 AM_CFLAGS = \
+	-pthread \
 	$(WARN_CFLAGS) \
 	-I$(top_srcdir)/include/drm \
 	-I$(top_srcdir)/nouveau \
@@ -7,7 +8,7 @@ AM_CFLAGS = \
 LDADD = \
 	../../nouveau/libdrm_nouveau.la \
 	../../libdrm.la \
-	-ldl -lpthread
+	-ldl
 
 TESTS = threaded