Tests: Cover using RTF for DMG SLAs

Tests/RunCMake/CPack/tests/DMG_SLA/English.license.rtf

@@ -0,0 +1,7 @@
+{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
+{\colortbl ;\red0\green0\blue255;}
+{\*\generator Riched20 10.0.18362}\viewkind4\uc1
+\pard\sa200\sl276\slmult1\b\f0\fs22\lang9 LICENSE\b0\par
+This is an installer created using CPack ({{\field{\*\fldinst{HYPERLINK https://cmake.org }}{\fldrslt{https://cmake.org\ul0\cf0}}}}\f0\fs22 ). No license provided.\par
+\par
+}

Tests/RunCMake/CPack/tests/DMG_SLA/English.license.txt

@@ -1,3 +0,0 @@
-LICENSE
--------
-This is an installer created using CPack (https://cmake.org). No license provided.

Tests/RunCMake/CPack/tests/DMG_SLA/VerifyResult.cmake

@@ -4,7 +4,7 @@ if(NOT res EQUAL 0)
   string(REPLACE "\n" "\n  " err "  ${err}")
   message(FATAL_ERROR "Running 'hdiutil udifderez -xml' on\n  ${dmg}\nfailed with:\n${err}")
 endif()
-foreach(key "LPic" "STR#" "TEXT")
+foreach(key "LPic" "STR#" "TEXT" "RTF ")
   if(NOT out MATCHES "<key>${key}</key>")
     string(REPLACE "\n" "\n  " out "  ${out}")
     message(FATAL_ERROR "error: running 'hdiutil udifderez -xml' on\n  ${dmg}\ndid not show '${key}' key:\n${out}")
@@ -19,9 +19,9 @@ foreach(line
     # STR# German first and last base64 lines
     "\tAAkGR2VybWFuC0FremVwdGllcmVuCEFibGVobmVuB0RydWNrZW4M\n"
     "\tYXVzZ2V3wopobHQgaXN0Lg==\n"
-    # TEXT English first and last base64 lines
-    "\tTElDRU5TRQ0tLS0tLS0tDVRoaXMgaXMgYW4gaW5zdGFsbGVyIGNy\n"
-    "\tTm8gbGljZW5zZSBwcm92aWRlZC4NDQ==\n"
+    # RTF English first and last base64 lines
+    "\te1xydGYxXGFuc2lcYW5zaWNwZzEyNTJcZGVmZjBcbm91aWNvbXBh\n"
+    "\tdmlkZWQuXHBhcg1ccGFyDX0NDQ==\n"
     # TEXT German first and last base64 lines
     "\tTElaRU5aDS0tLS0tLQ1EaWVzIGlzdCBlaW4gSW5zdGFsbGF0aW9u\n"
     "\tZ2ViZW4uDQ0=\n"