[Patch] BaseTools: Roll back GenFw Change to keep unknown field in RSDS debug entry

[Liming Gao <liming.gao@intel.com>]

https://lists.01.org/pipermail/edk2-devel/2017-August/013488.html
These fields are actually a GUID and DWORD respectively: the GUID identifies
the PDB to make it possible to verify that a given PDB matches the PE file,
and the DWORD is the "age" of the PDB which is simply a helper value that is
incremented by 1 by the linker every time the file is remade. Wiping the
GUID will cause PDB parsers (such as the MS DIA SDK that IDA and most other
tools use) to treat the PDB as a mismatch and refuse to load it.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
---
 BaseTools/Source/C/GenFw/GenFw.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/BaseTools/Source/C/GenFw/GenFw.c b/BaseTools/Source/C/GenFw/GenFw.c
index af60c92..33ba917 100644
--- a/BaseTools/Source/C/GenFw/GenFw.c
+++ b/BaseTools/Source/C/GenFw/GenFw.c
@@ -2903,13 +2903,7 @@ Returns:
       }
       if (DebugEntry->Type == EFI_IMAGE_DEBUG_TYPE_CODEVIEW) {
         RsdsEntry = (EFI_IMAGE_DEBUG_CODEVIEW_RSDS_ENTRY *) (FileBuffer + DebugEntry->FileOffset);
-        if (RsdsEntry->Signature == CODEVIEW_SIGNATURE_RSDS) {
-          RsdsEntry->Unknown  = 0;
-          RsdsEntry->Unknown2 = 0;
-          RsdsEntry->Unknown3 = 0;
-          RsdsEntry->Unknown4 = 0;
-          RsdsEntry->Unknown5 = 0;
-        } else if (RsdsEntry->Signature == CODEVIEW_SIGNATURE_MTOC) {
+        if (RsdsEntry->Signature == CODEVIEW_SIGNATURE_MTOC) {
           // MTOC sets DebugDirectoryEntrySize to size of the .debug section, so fix it.
           if (!ZeroDebugFlag) {
             if (Optional32Hdr->Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
-- 
2.8.0.windows.1