star2html: Use autoconf for tool discovery

We can not use a CPAN module in star2html because the program
is used during the build process before starperl has had the
CPAN dependencies sorted out. Instead we use autoconf to search
for the pdftops and pdf2ps commands.

applications/star2html/Makefile.am

@@ -26,6 +26,8 @@ l2hdir=$(DESTDIR)$(datadir)/latex2html/bin/
 
 edit=sed \
     -e 's,@ENV\@,$(ENV),g' \
+    -e 's,@PDFTOPS\@,$(PDFTOPS),g' \
+    -e 's,@PDF2PS\@,$(PDF2PS),g' \
     -e 's,@PACKAGE_VERSION\@,$(PACKAGE_VERSION),g' \
     -e 's,@PACKAGE_BUGREPORT\@,$(PACKAGE_BUGREPORT),g' \
     -e 's,@l2hdir\@,$(l2hdir),g'

applications/star2html/configure.ac

@@ -24,6 +24,8 @@ dnl    And requires that Perl is already built, from which we use the
 dnl    starperl command.
 STAR_DECLARE_DEPENDENCIES([configure], [perl])
 STAR_CHECK_PROGS([env])
+AC_CHECK_PROGS(PDF2PS, 'pdf2ps')
+AC_CHECK_PROGS(PDFTOPS, 'pdftops -eps')
 
 dnl    List the sun/ssn/... numbers which document this package and
 dnl    which are present as .tex files in this directory.

applications/star2html/star2html.in

@@ -257,6 +257,8 @@
 #          on exit
 #     31-AUG-2013 (TIMJ):
 #        - Convert PDF images to EPS
+#     2013-10-02 (TIMJ):
+#        - Use autoconf to find pdftops
 #     {enter_further_changes_here}
 
 #  Bugs:
@@ -270,7 +272,6 @@ use Cwd;
 use File::Spec;
 use Pod::Usage;
 use Getopt::Long;
-use File::SearchPath qw/ searchpath /;
 
 #  Print introductory message.
 my $announce = "Star2HTML V@PACKAGE_VERSION@";
@@ -435,12 +436,15 @@ if ( ( -T $TEXFILE ) && ( -r $TEXFILE ) ) {
    {
 
      # First work out which converter to use
+     my %TOOLS = ( pdftops => '@PDFTOPS@',
+                   pdf2ps => '@PDF2PS@',
+                 );
+
      my @pdftops;
      for my $tool (qw/ pdftops pdf2ps /) {
-       my $path = searchpath( $tool, $ENV{PATH} );
-       if (defined $path) {
-         push(@pdftops, $tool);
-         push(@pdftops, "-eps") if $tool eq 'pdftops';
+       my $exe = $TOOLS{$tool};
+       if ($exe) {
+         push(@pdftops, split(/\s+/,$exe));
          last;
        }
      }