Make tiff header usage conditional on LCMS support as intended.

--- ciberandy-qiv-14b562fe2fc3/qiv.h
+++ ciberandy-qiv-14b562fe2fc3/qiv.h
@@ -12,6 +12,7 @@
 #ifdef SUPPORT_LCMS
 #include <lcms2.h>
 #include <jpeglib.h>
+#include <tiffio.h>
 #endif
 
 /*
--- ciberandy-qiv-14b562fe2fc3/utils.c
+++ ciberandy-qiv-14b562fe2fc3/utils.c
@@ -17,7 +17,6 @@
 #include <dirent.h>
 #include <fcntl.h>
 #include <errno.h>
-#include <tiffio.h>
 #include <X11/extensions/dpms.h>
 #ifdef HAVE_EXIF
 #include <libexif/exif-loader.h>