Add tests/isc/uv_wrap.h to Makefile.am

The automake was missing reference to uv_wrap.h, so it was not added to
the distribution.  Add uv_wrap.h to SOURCES for both doh and netmgr unit
tests.

tests/isc/Makefile.am

@@ -52,6 +52,11 @@ doh_test_CPPFLAGS =	\
 doh_test_LDADD =	\
 	$(LDADD)	\
 	$(LIBNGHTTP2_LIBS)
+
+doh_test_SOURCES =	\
+	doh_test.c	\
+	uv_wrap.h
+
 endif HAVE_LIBNGHTTP2
 
 hmac_test_CPPFLAGS =	\
@@ -78,6 +83,10 @@ netmgr_test_LDADD =	\
 	$(LDADD)	\
 	$(OPENSSL_LIBS)
 
+netmgr_test_SOURCES =	\
+	netmgr_test.c	\
+	uv_wrap.h
+
 random_test_LDADD =	\
 	$(LDADD)	\
 	-lm