unittest/apiexample_test: Fix test for out-of-tree builds

The test expects to find phototest.tif and phototest.txt
in directory ../testing. Create symbolic links if those
files don't exist there.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

unittest/Makefile.am

@@ -59,3 +59,12 @@ tesseracttests_LDADD  += -lws2_32
 
 AM_CPPFLAGS += -I$(top_srcdir)/vs2010/port
 endif
+
+EXTRA_apiexample_test_DEPENDENCIES = $(abs_top_builddir)/testing/phototest.tif
+EXTRA_apiexample_test_DEPENDENCIES += $(abs_top_builddir)/testing/phototest.txt
+
+$(abs_top_builddir)/testing/phototest.tif:
+	ln -s $(top_srcdir)/testing/phototest.tif $(top_builddir)/testing/phototest.tif
+
+$(abs_top_builddir)/testing/phototest.txt:
+	ln -s $(top_srcdir)/testing/phototest.txt $(top_builddir)/testing/phototest.txt