add support for using system jpeg headers here for OpenBSD

third_party/iccjpeg/iccjpeg.h

 /*
  * iccprofile.h
  *
  * This file provides code to read and write International Color Consortium
  * (ICC) device profiles embedded in JFIF JPEG image files.  The ICC has
  * defined a standard format for including such data in JPEG "APP2" markers.
  * The code given here does not know anything about the internal structure
  * of the ICC profile data; it just knows how to put the profile data into
  * a JPEG file being written, or get it back out when reading.
  *
  * This code depends on new features added to the IJG JPEG library as of
  * IJG release 6b; it will not compile or work with older IJG versions.
  *
  * NOTE: this code would need surgery to work on 16-bit-int machines
  * with ICC profiles exceeding 64K bytes in size.  See iccprofile.c
  * for details.
  */
 
 #include <stdio.h>              /* needed to define "FILE", "NULL" */
+
+#if defined(USE_SYSTEM_LIBJPEG)
+#include <jpeglib.h>
+#else
 #include "jpeglib.h"
+#endif
 
 
 /*
  * This routine writes the given ICC profile data into a JPEG file.
  * It *must* be called AFTER calling jpeg_start_compress() and BEFORE
  * the first call to jpeg_write_scanlines().
  * (This ordering ensures that the APP2 marker(s) will appear after the
  * SOI and JFIF or Adobe markers, but before all else.)
  */
 
@@ skipping 33 matching lines @@
  * and must be freed by the caller with free() when the caller no longer
  * needs it.  (Alternatively, we could write this routine to use the
  * IJG library's memory allocator, so that the data would be freed implicitly
  * at jpeg_finish_decompress() time.  But it seems likely that many apps
  * will prefer to have the data stick around after decompression finishes.)
  */
 
 extern boolean read_icc_profile JPP((j_decompress_ptr cinfo,
                                      JOCTET **icc_data_ptr,
                                      unsigned int *icc_data_len));