LibCompress/LZW: Use its own debug flag

The file still used the `GIF_DEBUG` flag from when it was a part of the
GIF decoder. Let's give `LZWDecoder` its own flag.

AK/Debug.h.in

@@ -282,6 +282,10 @@
 #    cmakedefine01 LZMA_DEBUG
 #endif
 
+#ifndef LZW_DEBUG
+#    cmakedefine01 LZW_DEBUG
+#endif
+
 #ifndef MALLOC_DEBUG
 #    cmakedefine01 MALLOC_DEBUG
 #endif

Meta/CMake/all_the_debug_macros.cmake

@@ -110,6 +110,7 @@ set(LOCK_TRACE_DEBUG ON)
 set(LOOKUPSERVER_DEBUG ON)
 set(LOOPBACK_DEBUG ON)
 set(LZMA_DEBUG ON)
+set(LZW_DEBUG ON)
 set(MALLOC_DEBUG ON)
 set(MARKDOWN_DEBUG ON)
 set(MATROSKA_DEBUG ON)

Userland/Libraries/LibCompress/LZWDecoder.h

@@ -60,12 +60,12 @@ public:
         m_current_code = TRY(m_bit_stream->template read_bits<u16>(m_code_size));
 
         if (m_current_code > m_code_table.size()) {
-            dbgln_if(GIF_DEBUG, "Corrupted LZW stream, invalid code: {}, code table size: {}",
+            dbgln_if(LZW_DEBUG, "Corrupted LZW stream, invalid code: {}, code table size: {}",
                 m_current_code,
                 m_code_table.size());
             return Error::from_string_literal("Corrupted LZW stream, invalid code");
         } else if (m_current_code == m_code_table.size() && m_output.is_empty()) {
-            dbgln_if(GIF_DEBUG, "Corrupted LZW stream, valid new code but output buffer is empty: {}, code table size: {}",
+            dbgln_if(LZW_DEBUG, "Corrupted LZW stream, valid new code but output buffer is empty: {}, code table size: {}",
                 m_current_code,
                 m_code_table.size());
             return Error::from_string_literal("Corrupted LZW stream, valid new code but output buffer is empty");