Revert "doc: add script to compute texi files dependencies"

This reverts commit 628ceac652.

The commit broke out of tree builds

configure

@@ -2214,8 +2214,8 @@ ffserver_extralibs='$ldl'
 # documentation
 podpages_deps="perl"
 manpages_deps="perl pod2man"
-htmlpages_deps="perl texi2html"
-txtpages_deps="perl makeinfo"
+htmlpages_deps="texi2html"
+txtpages_deps="makeinfo"
 doc_deps_any="manpages htmlpages podpages txtpages"
 
 # default parameters

doc/Makefile

@@ -43,7 +43,7 @@ doc: documentation
 apidoc: doc/doxy/html
 documentation: $(DOCS)
 
-TEXIDEP = perl $(SRC_PATH)/doc/texidep.pl $< $@ >$(@:%=%.d)
+TEXIDEP = awk '/^@(verbatim)?include/ { printf "$@: $(@D)/%s\n", $$2 }' <$< >$(@:%=%.d)
 
 doc/%.txt: TAG = TXT
 doc/%.txt: doc/%.texi

doc/texidep.pl

@@ -1,22 +0,0 @@
-#! /usr/bin/perl
-
-use warnings;
-use strict;
-
-my ($root, $target) = @ARGV;
-
-sub print_deps {
-    my ($file, $deps) = @_;
-    $deps->{$file} = 1;
-
-    open(my $fh, "$file") or die "Cannot open file '$file': $!";
-    while (<$fh>) {
-        /^@(?:verbatim)?include\s+(\S+)/ and do {
-            die "Circular dependency found in file $root\n" if exists $deps->{"doc/$1"};
-            print "$target: doc/$1\n";
-            print_deps("doc/$1", {%$deps});
-        }
-    }
-}
-
-print_deps($root, {});