[debugserver] Delete macOS/PPC debug server implementation

macOS/PPC support was dropped in 10.6 (Snow Leopard).

Differential Revision: https://reviews.llvm.org/D69524

Author: vedantk

lldb/tools/debugserver/source/MacOSX/CMakeLists.txt

@@ -26,11 +26,6 @@ if(NOT LLDB_DEBUGSERVER_ARCH OR "${LLDB_DEBUGSERVER_ARCH}" MATCHES ".*86.*")
   include_directories(${CURRENT_SOURCE_DIR}/i386 ${CURRENT_SOURCE_DIR}/x86_64)
 endif()
 
-if("${LLDB_DEBUGSERVER_ARCH}" MATCHES ".*ppc.*")
-  list(APPEND SOURCES ppc/DNBArchImpl.cpp)
-  include_directories(${CURRENT_SOURCE_DIR}/ppc)
-endif()
-
 add_subdirectory(DarwinLog)
 
 include_directories(..)