Fix linker error for baseapi_test when building without legacy engine

Linker error reported in issue #2439:

    unittest/baseapi_test.cc:190:
      undefined reference to
      `tesseract::TessBaseAPI::AdaptToWordStr(tesseract::PageSegMode, char const*)'

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

unittest/Makefile.am

@@ -20,6 +20,9 @@ AM_CPPFLAGS += -DTESSDATA_BEST_DIR="\"$(TESSDATA_BEST_DIR)\""
 AM_CPPFLAGS += -DTESTING_DIR="\"$(TESTING_DIR)\""
 AM_CPPFLAGS += -DTESTDATA_DIR="\"$(TESTDATA_DIR)\""
 AM_CPPFLAGS += -DPANGO_ENABLE_ENGINE
+if DISABLED_LEGACY_ENGINE
+AM_CPPFLAGS += -DDISABLED_LEGACY_ENGINE
+endif
 AM_CPPFLAGS += -I$(top_builddir)/src/api
 AM_CPPFLAGS += -I$(top_srcdir)/src/api
 AM_CPPFLAGS += -I$(top_srcdir)/src/arch

unittest/baseapi_test.cc

@@ -166,6 +166,10 @@ TEST_F(TesseractTest, RickSnyderNotFuckSnyder) {
 
 // Tests that Tesseract gets exactly the right answer on some page numbers.
 TEST_F(TesseractTest, AdaptToWordStrTest) {
+#ifdef DISABLED_LEGACY_ENGINE
+  // Skip test because TessBaseAPI::AdaptToWordStr is missing.
+  GTEST_SKIP();
+#else
   static const char* kTrainingPages[] = {
       "136.tif", "256.tif", "410.tif", "432.tif", "540.tif",
       "692.tif", "779.tif", "793.tif", "808.tif", "815.tif",
@@ -204,6 +208,7 @@ TEST_F(TesseractTest, AdaptToWordStrTest) {
     EXPECT_STREQ(kTestText[i], ocr_text.c_str());
     pixDestroy(&src_pix);
   }
+#endif
 }
 
 // Tests that LSTM gets exactly the right answer on phototest.