Tests/File_Archive: Relax stderr line matching

"Compression format unsupported" errors of this form can only possibly
come from `file(ARCHIVE_CREATE)`, so we don't need to track the line
number of the called function. Reduce the need to update these numbers
every time the test helper script is updated.

Tests/RunCMake/File_Archive/gnutar-with-bad-compression-stderr.txt

@@ -1,4 +1,4 @@
-CMake Error at roundtrip\.cmake:38 \(file\):
+CMake Error at roundtrip\.cmake:[0-9]+ \(file\):
   file PPMd compression is not supported for gnutar format
 Call Stack \(most recent call first\):
   gnutar-with-bad-compression\.cmake:6 \(include\)

Tests/RunCMake/File_Archive/unsupported-format-stderr.txt

@@ -1,4 +1,4 @@
-CMake Error at roundtrip\.cmake:38 \(file\):
+CMake Error at roundtrip\.cmake:[0-9]+ \(file\):
   file archive format rar not supported
 Call Stack \(most recent call first\):
   unsupported-format\.cmake:5 \(include\)

Tests/RunCMake/File_Archive/zip-with-bad-compression-stderr.txt

@@ -1,4 +1,4 @@
-CMake Error at roundtrip\.cmake:38 \(file\):
+CMake Error at roundtrip\.cmake:[0-9]+ \(file\):
   file PPMd compression is not supported for zip format
 Call Stack \(most recent call first\):
   zip-with-bad-compression\.cmake:6 \(include\)