Add semicolons to eval'd strings to hide a minor Perl behavioral change.

"eval q{foo}" used to complain that the error was on line 2 of the eval'd
string, because eval internally tacked on "\n;" so that the end of the
erroneous command was indeed on line 2.  But as of Perl 5.18 it more
sanely says that the error is on line 1.  To avoid Perl-version-dependent
regression test results, use "eval q{foo;}" instead in the two places
where this matters.  Per buildfarm.

Since people might try to use newer Perl versions with older PG releases,
back-patch as far as 9.0 where these test cases were added.

src/pl/plperl/expected/plperl.out

@@ -626,8 +626,8 @@ DO $$ open my $fh, "</nonesuch"; $$ LANGUAGE plperl;
 ERROR:  'open' trapped by operation mask at line 1.
 CONTEXT:  PL/Perl anonymous code block
 -- check that eval is allowed and eval'd restricted ops are caught
-DO $$ eval q{chdir '.'}; warn "Caught: $@"; $$ LANGUAGE plperl;
-WARNING:  Caught: 'chdir' trapped by operation mask at line 2.
+DO $$ eval q{chdir '.';}; warn "Caught: $@"; $$ LANGUAGE plperl;
+WARNING:  Caught: 'chdir' trapped by operation mask at line 1.
 CONTEXT:  PL/Perl anonymous code block
 -- check that compiling do (dofile opcode) is allowed
 -- but that executing it for a file not already loaded (via require) dies

src/pl/plperl/expected/plperl_init.out

 -- test plperl.on_plperl_init errors are fatal
 -- This test tests setting on_plperl_init after loading plperl
 LOAD 'plperl';
-SET SESSION plperl.on_plperl_init = ' system("/nonesuch") ';
+SET SESSION plperl.on_plperl_init = ' system("/nonesuch"); ';
 SHOW plperl.on_plperl_init;
- plperl.on_plperl_init 
------------------------
-  system("/nonesuch") 
+ plperl.on_plperl_init  
+------------------------
+  system("/nonesuch"); 
 (1 row)
 
 DO $$ warn 42 $$ language plperl;
-ERROR:  'system' trapped by operation mask at line 2.
+ERROR:  'system' trapped by operation mask at line 1.
 CONTEXT:  while executing plperl.on_plperl_init
 PL/Perl anonymous code block

src/pl/plperl/sql/plperl.sql

@@ -405,7 +405,7 @@ DO $$ qx("/nonesuch"); $$ LANGUAGE plperl;
 DO $$ open my $fh, "</nonesuch"; $$ LANGUAGE plperl;
 
 -- check that eval is allowed and eval'd restricted ops are caught
-DO $$ eval q{chdir '.'}; warn "Caught: $@"; $$ LANGUAGE plperl;
+DO $$ eval q{chdir '.';}; warn "Caught: $@"; $$ LANGUAGE plperl;
 
 -- check that compiling do (dofile opcode) is allowed
 -- but that executing it for a file not already loaded (via require) dies

src/pl/plperl/sql/plperl_init.sql

@@ -3,7 +3,7 @@
 -- This test tests setting on_plperl_init after loading plperl
 LOAD 'plperl';
 
-SET SESSION plperl.on_plperl_init = ' system("/nonesuch") ';
+SET SESSION plperl.on_plperl_init = ' system("/nonesuch"); ';
 
 SHOW plperl.on_plperl_init;