Unbreak the build: as of recently, <assert.h> header file must be included

before <Magick++.h> because of the following conflict:

  [...]: error: use of undeclared identifier '__assert'; did you mean
        'MagickCore::__assert'?
          assert( file.colorSpace() == Magick::sRGBColorspace );
          ^
  /usr/include/assert.h:56:36: note: expanded from macro 'assert'
  #define assert(e)       ((e) ? (void)0 : __assert(__func__, __FILE__, \

  /usr/include/assert.h:77:6: note: 'MagickCore::__assert' declared here
  void __assert(const char *, const char *, int, const char *) __dead2;

Reported by:	pkg-fallout

1 files changed, 18 insertions, 0 deletions

diff --git a/graphics/hdr_tools/files/patch-headers.hh b/graphics/hdr_tools/files/patch-headers.hh
new file mode 100644
index 000000000000..1d544c12c1b9
--- /dev/null
+++ b/graphics/hdr_tools/files/patch-headers.hh
@@ -0,0 +1,18 @@
+--- headers.hh.orig	2010-11-23 21:22:52 UTC
++++ headers.hh
+@@ -30,6 +30,7 @@
+ 
+ 
+ 
++#include <assert.h>
+ #include <popt.h>
+ #include <tiff.h>
+ #include <tiffio.h>
+@@ -61,7 +62,6 @@
+ #include <cmath>
+ 
+ 
+-#include <assert.h>
+ #include <stdlib.h>
+ #include <math.h>
+ #include <stdint.h>