Replace the unavailable linked test-cases for PR 2606 with reduced test-cases

Re: PR 2606.

test/pdfs/.gitignore

@@ -5,6 +5,7 @@
 !TrueType_without_cmap.pdf
 !franz.pdf
 !franz_2.pdf
+!german-umlaut-r.pdf
 !xref_command_missing.pdf
 !issue2391-1.pdf
 !issue2391-2.pdf
@@ -165,6 +166,7 @@
 !issue5334.pdf
 !bug1186827.pdf
 !issue215.pdf
+!issue1512r.pdf
 !issue2128r.pdf
 !issue5540.pdf
 !issue5549.pdf

test/pdfs/german-umlaut.pdf.link

@@ -1 +0,0 @@
-https://dok.dkb.de/pdf/aenderung_l_sepa.pdf

test/pdfs/issue1512.pdf.link

@@ -1 +0,0 @@
-http://www.aeinstein.org/organizations/org/FDTD.pdf

test/test_manifest.json

@@ -164,10 +164,9 @@
        "type": "eq"
     },
     {  "id": "german-umlaut",
-       "file": "pdfs/german-umlaut.pdf",
-       "md5": "fb4948876f5ff57847f94192aa3df211",
-       "link": true,
-       "lastPage": 1,
+       "file": "pdfs/german-umlaut-r.pdf",
+       "md5": "baa2cd74c76473cf7b914a17403a7f9a",
+       "link": false,
        "rounds": 1,
        "type": "eq"
     },
@@ -195,10 +194,9 @@
        "type": "eq"
     },
     {  "id": "issue1512",
-       "file": "pdfs/issue1512.pdf",
-       "md5": "41a19fe03d522346ee3baa732403fca4",
-       "link": true,
-       "lastPage": 1,
+       "file": "pdfs/issue1512r.pdf",
+       "md5": "af48ede2658d99cca423147085c6609b",
+       "link": false,
        "rounds": 1,
        "type": "eq"
     },