Fix .pdb filter comment — these are our build artifacts, not CE files

Real CE devices never have .pdb files. Our bundled VFS directory
contains them alongside the ARM binaries as build artifacts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dz333n

cerf/thunks/coredll/file.cpp

@@ -21,11 +21,11 @@ static bool IsDotOrDotDot(const wchar_t* name) {
     return (name[0] == L'.' && (name[1] == 0 || (name[1] == L'.' && name[2] == 0)));
 }
 
-/* Hide .pdb files from directory enumeration.  This modifies the real result
-   but exists solely to make the \Windows directory browsable in CE explorer,
-   which chokes on the sheer number of files (even real CE devices with full
-   SDK installs are sluggish).  Remove this filter when there are real use
-   cases for ARM code to see .pdb files in CE directories. */
+/* Hide .pdb files from directory enumeration.  Our bundled VFS \Windows
+   directory contains .pdb debug symbols alongside the ARM binaries — real
+   CE devices never have these.  Without filtering, the extra files make
+   explorer's directory listing painfully slow.  Remove this filter if there
+   is ever a reason for ARM code to see .pdb files. */
 static bool IsPdbFile(const wchar_t* name) {
     size_t len = wcslen(name);
     return len > 4 && _wcsicmp(name + len - 4, L".pdb") == 0;