unittest: Add missing libarchive

It is needed for the tests if Tesseract was built with libarchive.

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

Author: stweil

unittest/Makefile.am

@@ -94,7 +94,7 @@ libgmock_main_la_CPPFLAGS = $(GMOCK_INCLUDES) \
 ABSEIL_LIBS = libabseil.la
 GTEST_LIBS =  libgtest.la libgtest_main.la -lpthread
 GMOCK_LIBS =  libgmock.la libgmock_main.la
-TESS_LIBS = $(top_builddir)/src/api/libtesseract.la
+TESS_LIBS = $(top_builddir)/src/api/libtesseract.la $(libarchive_LIBS)
 TRAINING_LIBS = $(top_builddir)/src/training/libtesseract_training.la
 TRAINING_LIBS += $(top_builddir)/src/training/libtesseract_tessopt.la
 AM_CPPFLAGS +=   -isystem $(top_srcdir)/googletest/googletest/include \