Fix make distcheck and missing tests/Makefile.in

This patch fixes the build regressions in libuev v1.5.1, which are due
to the new unit test framework.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

Makefile.am

@@ -8,7 +8,7 @@ libuev_la_LDFLAGS   = $(AM_LDFLAGS) -version-info 1:2:0
 
 noinst_PROGRAMS     = bench
 bench_CPPFLAGS      = -D_GNU_SOURCE
-bench_LDADD         = $(top_srcdir)/libuev.la
+bench_LDADD         = libuev.la
 
 pkgconfigdir        = $(libdir)/pkgconfig
 pkgincludedir       = $(includedir)/uev
@@ -16,8 +16,7 @@ pkgconfig_DATA      = libuev.pc
 pkginclude_HEADERS  = uev.h private.h queue.h
 doc_DATA            = README.md LICENSE
 EXTRA_DIST          = README.md LICENSE AUTHORS ChangeLog.md
-
-DIST_SUBDIRS        = examples
+DIST_SUBDIRS        = examples tests
 SUBDIRS             = tests
 
 ## Generate MD5 checksum file