OcBootManagementLib: Fixed CLANGPDB builds by shortening OC magic

Changelog.md

@@ -9,6 +9,7 @@ OpenCore Changelog
 - Increased default APFS `MinDate` and `MinVersion` to macOS Big Sur for better security
 - Updated builtin firmware versions for SMBIOS and the rest
 - Improved SSDT-PNLF compatibility with Windows and newer graphics
+- Fixed CLANGPDB OpenCore builds by shortening OC magic
 
 #### v0.7.1
 - Added `SyncTableIds` quirk to sync modified table OEM identifiers

Library/OcBootManagementLib/BootEntryManagement.c

@@ -215,13 +215,13 @@ IsOpenCoreBootloader (
     0x0E, 0x1F, 0xBA, 0x10, 0x00, 0xB4, 0x09, 0xCD, 0x21, 0xB8, 0x01, 0x4C, 0xCD, 0x21, 0x0F, 0x0B,
     0x4F, 0x70, 0x65, 0x6E, 0x43, 0x6F, 0x72, 0x65, 0x20, 0x42, 0x6F, 0x6F, 0x74, 0x6C, 0x6F, 0x61,
     0x64, 0x65, 0x72, 0x20, 0x28, 0x63, 0x29, 0x20, 0x41, 0x63, 0x69, 0x64, 0x61, 0x6E, 0x74, 0x68,
-    0x65, 0x72, 0x61, 0x20, 0x52, 0x65, 0x73, 0x65, 0x61, 0x72, 0x63, 0x68, 0x0D, 0x0A, 0x24, 0x00 
+    0x65, 0x72, 0x61
   };
 
   EFI_STATUS        Status;
 
   EFI_FILE_PROTOCOL *File;
-  UINT8             FileReadMagic[sizeof (OpenCoreMagic)];
+  UINT8             FileReadMagic[0x40];
 
   Status = OcOpenFileByDevicePath (
     &DevicePath,

build_oc.tool

@@ -115,7 +115,7 @@ package() {
       )
     for efiOCBM in "${efiOCBMs[@]}"; do
       dd if="${bootsig}" \
-         of="${arch}/${efiOCBM}" seek=64 bs=1 count=64 conv=notrunc || exit 1
+         of="${arch}/${efiOCBM}" seek=64 bs=1 count=56 conv=notrunc || exit 1
     done
 
     # copy OpenCore main program.