Re: TIFF compression support list

With the following patch, the build completed.  And compression support
list doesn't mention LZW anymore:

> ./rungm.sh ./utilities/gm convert -list formats | grep -A1 " TIFF P"
>      TIFF P  rw+  Tagged Image File Format (LIBTIFF, Version 4.1.0)
>             Supported Compressions: None, Fax/Group3, Group4, JBIG, JPEG, LZMA, RLE, ZIP, ZSTD, WEBP

Still WEBP compression support is indicated, even though libwebp-dev is
not installed.

Best,
fux

diff -r d97320e45918 coders/tiff.c
--- a/coders/tiff.c	Sat Sep 23 16:13:36 2023 -0500
+++ b/coders/tiff.c	Thu Sep 28 18:00:06 2023 +0200
@@ -63,6 +63,7 @@
 #  endif
 #  include "tiff.h"
 #  include "tiffio.h"
+#  undef COMPRESSION_LZW
 #  if !defined(COMPRESSION_ADOBE_DEFLATE)
 #     define COMPRESSION_ADOBE_DEFLATE  8
 #  endif  /* !defined(COMPRESSION_ADOBE_DEFLATE) */
@@ -653,9 +654,11 @@
       result="JBIG";
       break;
 #endif
+#if defined(COMPRESSION_LZW)
     case COMPRESSION_LZW:
       result="LZW";
       break;
+#endif
 #if defined(COMPRESSION_NEXT)
     case COMPRESSION_NEXT:
       result="NeXT 2-bit RLE";
@@ -2199,9 +2202,11 @@
         case COMPRESSION_OJPEG:
           image->compression=JPEGCompression;
           break;
+#if defined(COMPRESSION_LZW)
         case COMPRESSION_LZW:
           image->compression=LZWCompression;
           break;
+#endif
 #if defined(COMPRESSION_LZMA)
         case COMPRESSION_LZMA:
           image->compression=LZMACompression;
@@ -4746,11 +4751,13 @@
             compress_tag=COMPRESSION_JPEG;
             break;
           }
+#if defined(COMPRESSION_LZW)
         case LZWCompression:
           {
             compress_tag=COMPRESSION_LZW;
             break;
           }
+#endif
 #if defined(COMPRESSION_LZMA)
         case LZMACompression:
           {
@@ -5541,6 +5548,7 @@
             break;
           }
 #endif /* COMPRESSION_JBIG */
+#if defined(COMPRESSION_LZW)
         case COMPRESSION_LZW:
           {
             /*
@@ -5554,6 +5562,7 @@
               predictor=PREDICTOR_HORIZONTAL;
             break;
           }
+#endif
 #if defined(COMPRESSION_ZSTD)
         case COMPRESSION_ZSTD:
           {