[lldb/cmake] Normalize use of HAVE_LIBCOMPRESSION (#135528)

I *think* this was the reason behind the failures in
2fd860c1f559c0b0be66cc000e38270a04d0a1a3: the clang include tool showed
the Config.h headers as unused, and because the macro was referenced
through an `#ifdef`, its removal didn't cause build failures. Switching
to `#cmakedefine01` + `#if` should make sure this does not happen again.

According to D48977, the `#ifndef`+`#cmakedefine` patterns is due to
some files redefining the macro themselves. I no longer see any such
files in the source tree (there also were no files like that in the
source tree at the revision mentioned, but the macro *was* defined in
the hand-maintained XCode project we had at the time).

1 files changed, 3 insertions, 9 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
index 501670d..748f95c 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
@@ -41,7 +41,7 @@
 #include "llvm/Config/llvm-config.h" // for LLVM_ENABLE_ZLIB
 #include "llvm/Support/JSON.h"
 
-#if defined(HAVE_LIBCOMPRESSION)
+#if HAVE_LIBCOMPRESSION
 #include <compression.h>
 #endif
 
@@ -1104,7 +1104,7 @@ void GDBRemoteCommunicationClient::MaybeEnableCompression(
   CompressionType avail_type = CompressionType::None;
   llvm::StringRef avail_name;
 
-#if defined(HAVE_LIBCOMPRESSION)
+#if HAVE_LIBCOMPRESSION
   if (avail_type == CompressionType::None) {
     for (auto compression : supported_compressions) {
       if (compression == "lzfse") {
@@ -1114,9 +1114,6 @@ void GDBRemoteCommunicationClient::MaybeEnableCompression(
       }
     }
   }
-#endif
-
-#if defined(HAVE_LIBCOMPRESSION)
   if (avail_type == CompressionType::None) {
     for (auto compression : supported_compressions) {
       if (compression == "zlib-deflate") {
@@ -1140,7 +1137,7 @@ void GDBRemoteCommunicationClient::MaybeEnableCompression(
   }
 #endif
 
-#if defined(HAVE_LIBCOMPRESSION)
+#if HAVE_LIBCOMPRESSION
   if (avail_type == CompressionType::None) {
     for (auto compression : supported_compressions) {
       if (compression == "lz4") {
@@ -1150,9 +1147,6 @@ void GDBRemoteCommunicationClient::MaybeEnableCompression(
       }
     }
   }
-#endif
-
-#if defined(HAVE_LIBCOMPRESSION)
   if (avail_type == CompressionType::None) {
     for (auto compression : supported_compressions) {
       if (compression == "lzma") {