Improvements to page checksum module and tests:

* Page checksum module uses new C error handler.
* Convert page checksum tests into C unit tests.

test/lib/pgBackRestTest/Common/DefineTest.pm

@@ -174,6 +174,25 @@ my $oTestDef =
                 },
             ]
         },
+        # PostgreSQL tests
+        {
+            &TESTDEF_NAME => 'postgres',
+            &TESTDEF_CONTAINER => true,
+
+            &TESTDEF_TEST =>
+            [
+                {
+                    &TESTDEF_NAME => 'page-checksum',
+                    &TESTDEF_TOTAL => 3,
+                    &TESTDEF_C => true,
+
+                    &TESTDEF_COVERAGE =>
+                    {
+                        'postgres/pageChecksum' => TESTDEF_COVERAGE_FULL,
+                    },
+                },
+            ]
+        },
         # Help tests
         {
             &TESTDEF_NAME => 'help',

test/lib/pgBackRestTest/Common/JobTest.pm

@@ -246,9 +246,6 @@ sub run
                     # Skip all files except .c files (including .auto.c)
                     next if $strFile !~ /(?<!\.auto)\.c$/;
 
-                    # ??? Temporarily skip because it has Perl includes which will be removed in a later commit
-                    next if $strFile =~ /pageChecksum.c$/;
-
                     if (!defined($hTestCoverage->{substr($strFile, 0, length($strFile) - 2)}))
                     {
                         push(@stryCFile, "${strCSrcPath}/${strFile}");