More fixed for modern perl on back branches

Use "do" instead of "require" for included files, as it doesn't look for
them in the search path but relative to the current working directory.
These changes have already been made to REL_10_STABLE and later, to
satisfy the demands of perlcritic, but need backporting now to earlier
branches.

src/tools/msvc/Install.pm

@@ -58,8 +58,8 @@ sub Install
 
 		# suppress warning about harmless redeclaration of $config
 		no warnings 'misc';
-		require "config_default.pl";
-		require "config.pl" if (-f "config.pl");
+		do "config_default.pl";
+		do "config.pl" if (-f "config.pl");
 	}
 
 	chdir("../../..")    if (-f "../../../configure");

src/tools/msvc/build.pl

@@ -21,17 +21,17 @@ use Mkvcbuild;
 
 if (-e "src/tools/msvc/buildenv.pl")
 {
-	require "src/tools/msvc/buildenv.pl";
+	do "src/tools/msvc/buildenv.pl";
 }
 elsif (-e "./buildenv.pl")
 {
-	require "./buildenv.pl";
+	do "./buildenv.pl";
 }
 
 # set up the project
 our $config;
-require "config_default.pl";
-require "config.pl" if (-f "src/tools/msvc/config.pl");
+do "config_default.pl";
+do "config.pl" if (-f "src/tools/msvc/config.pl");
 
 my $vcver = Mkvcbuild::mkvcbuild($config);
 

src/tools/msvc/builddoc.pl

@@ -18,7 +18,7 @@ chdir '../../..' if (-d '../msvc' && -d '../../../src');
 
 noversion() unless -e 'doc/src/sgml/version.sgml';
 
-require 'src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
+do 'src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
 
 my $docroot = $ENV{DOCROOT};
 die "bad DOCROOT '$docroot'" unless ($docroot && -d $docroot);

src/tools/msvc/install.pl

@@ -18,11 +18,11 @@ use Install qw(Install);
 
 if (-e "src/tools/msvc/buildenv.pl")
 {
-	require "src/tools/msvc/buildenv.pl";
+	do "src/tools/msvc/buildenv.pl";
 }
 elsif (-e "./buildenv.pl")
 {
-	require "./buildenv.pl";
+	do "./buildenv.pl";
 }
 
 my $target = shift || Usage();

src/tools/msvc/mkvcbuild.pl

@@ -23,7 +23,7 @@ print "Warning: no config.pl found, using default.\n"
   unless (-f 'src/tools/msvc/config.pl');
 
 our $config;
-require 'src/tools/msvc/config_default.pl';
-require 'src/tools/msvc/config.pl' if (-f 'src/tools/msvc/config.pl');
+do 'src/tools/msvc/config_default.pl';
+do 'src/tools/msvc/config.pl' if (-f 'src/tools/msvc/config.pl');
 
 Mkvcbuild::mkvcbuild($config);

src/tools/msvc/pgbison.pl

@@ -7,7 +7,7 @@ use File::Basename;
 
 # assume we are in the postgres source root
 
-require 'src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
+do 'src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
 
 my ($bisonver) = `bison -V`;    # grab first line
 $bisonver = (split(/\s+/, $bisonver))[3];    # grab version number

src/tools/msvc/pgflex.pl

@@ -10,7 +10,7 @@ use File::Basename;
 
 # assume we are in the postgres source root
 
-require 'src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
+do 'src/tools/msvc/buildenv.pl' if -e 'src/tools/msvc/buildenv.pl';
 
 my ($flexver) = `flex -V`;    # grab first line
 $flexver = (split(/\s+/, $flexver))[1];

src/tools/msvc/vcregress.pl

@@ -22,8 +22,8 @@ chdir "../../.." if (-d "../../../src/tools/msvc");
 my $topdir         = getcwd();
 my $tmp_installdir = "$topdir/tmp_install";
 
-require 'src/tools/msvc/config_default.pl';
-require 'src/tools/msvc/config.pl' if (-f 'src/tools/msvc/config.pl');
+do 'src/tools/msvc/config_default.pl';
+do 'src/tools/msvc/config.pl' if (-f 'src/tools/msvc/config.pl');
 
 # buildenv.pl is for specifying the build environment settings
 # it should contain lines like:
@@ -31,7 +31,7 @@ require 'src/tools/msvc/config.pl' if (-f 'src/tools/msvc/config.pl');
 
 if (-e "src/tools/msvc/buildenv.pl")
 {
-	require "src/tools/msvc/buildenv.pl";
+	do "src/tools/msvc/buildenv.pl";
 }
 
 my $what = shift || "";