FS-11368: [mod_flite] Use system libflite.

configure.ac

@@ -1427,24 +1427,25 @@ PKG_CHECK_MODULES([SOUNDTOUCH], [soundtouch >= 1.7.0],[
   AM_CONDITIONAL([HAVE_SOUNDTOUCH],[true])],[
   AC_MSG_RESULT([no]); AM_CONDITIONAL([HAVE_SOUNDTOUCH],[false])])
 
-PKG_CHECK_MODULES([FLITE], [flite >= 2],[
-  AM_CONDITIONAL([HAVE_FLITE],[true])],[
+flite="true"
+PKG_CHECK_MODULES([FLITE], [flite >= 2],[],[
   AC_CHECK_LIB([flite], [flite_init],[
     AC_CHECK_HEADERS([flite/flite.h],[      
-      AM_CONDITIONAL([HAVE_FLITE],[true])
       FLITE_LIBS="-lflite -lflite_cmu_grapheme_lang -lflite_cmu_grapheme_lex -lflite_cmu_indic_lang -lflite_cmu_indic_lex -lflite_cmulex -lflite_cmu_time_awb -lflite_cmu_us_awb -lflite_cmu_us_kal16 -lflite_cmu_us_kal -lflite_cmu_us_rms -lflite_cmu_us_slt -lflite_usenglish"
       FLITE_CFLAGS=""
     ], [
-      if module_enabled mod_flite; then
+    flite="false"
+    if module_enabled mod_flite; then
         AC_MSG_ERROR([You must install libflite-dev to build mod_flite])
       else
         AC_MSG_RESULT([no])
-        AM_CONDITIONAL([HAVE_FLITE],[false])
       fi
     ])
   ])
 ])
 
+AM_CONDITIONAL([HAVE_FLITE],[$flite])
+
 PKG_CHECK_MODULES([MONGOC], [libmongoc-1.0 >= 1.0.8],[
   AM_CONDITIONAL([HAVE_MONGOC],[true])],[
   AC_MSG_RESULT([no]); AM_CONDITIONAL([HAVE_MONGOC],[false])])