remove ARPACK files from sources and restore configure checks for external ARPACK library * libcruft/arpack: Remove directory and all files. * libcruft/Makefile.am: Don't include arpack/module.mk. * m4/acinclude.m4 (OCTAVE_CHECK_ARPACK_OK): New macro. * configure.ac: Check for ARPACK. Use OCTAVE_CHECK_ARPACK_OK to test for known bug. * build-aux/common.mk (ARPACK_CPPFLAGS, ARPACK_LDFLAGS, ARPACK_LIBS): Restore variables. (do_subst_config_vals): Substitute them. * eigs-base.cc: Use HAVE_ARPACK again. * sparse/svds.m: Use "testif HAVE_ARPACK" instead of "test". * DLD-FUNCTIONS/eigs.cc (Feigs): Restore HAVE_ARPACK conditionals. Use "testif HAVE_ARPACK" instead of "test". * toplev.cc (octave_config_info): Restore ARPACK_CPPFLAGS, ARPACK_LDFLAGS, ARPACK_LIBS to the struct. * oct-conf.h.in (OCTAVE_CONF_ARPACK_CPPFLAGS, OCTAVE_CONF_ARPACK_LDFLAGS, OCTAVE_CONF_ARPACK_LIBS): Restore #defines.

--- a/build-aux/common.mk	Tue Jan 03 12:03:12 2012 -0500
+++ b/build-aux/common.mk	Tue Jan 03 20:12:38 2012 -0500
@@ -243,6 +243,10 @@
 READLINE_LIBS = @READLINE_LIBS@
 TERM_LIBS = @TERM_LIBS@
 
+ARPACK_CPPFLAGS = @ARPACK_CPPFLAGS@
+ARPACK_LDFLAGS = @ARPACK_LDFLAGS@
+ARPACK_LIBS = @ARPACK_LIBS@
+
 DL_LIBS = @DL_LIBS@
 LIBS = @LIBS@
 
@@ -452,6 +456,9 @@
   -e "s|%OCTAVE_CONF_AMD_LIBS%|\"${AMD_LIBS}\"|" \
   -e "s|%OCTAVE_CONF_AR%|\"${AR}\"|" \
   -e "s|%OCTAVE_CONF_ARFLAGS%|\"${ARFLAGS}\"|" \
+  -e "s|%OCTAVE_CONF_ARPACK_CPPFLAGS%|\"${ARPACK_CPPFLAGS}\"|" \
+  -e "s|%OCTAVE_CONF_ARPACK_LDFLAGS%|\"${ARPACK_LDFLAGS}\"|" \
+  -e "s|%OCTAVE_CONF_ARPACK_LIBS%|\"${ARPACK_LIBS}\"|" \
   -e "s|%OCTAVE_CONF_BLAS_LIBS%|\"${BLAS_LIBS}\"|" \
   -e "s|%OCTAVE_CONF_CAMD_CPPFLAGS%|\"${CAMD_CPPFLAGS}\"|" \
   -e "s|%OCTAVE_CONF_CAMD_LDFLAGS%|\"${CAMD_LDFLAGS}\"|" \