Disable part of the gdimagerotate test on architectures such as i686
where intermediate floating-point operations are done with 80-bit long
doubles, and typically later rounded to 64-bit doubles.  This double
rounding causes small differences in the resulting pixel values
compared with other architectures, causing the image comparison to
fail.

Patch by Mark H Weaver <mhw@netris.org>.

--- libgd-2.2.2/tests/gdimagerotate/bug00067.c	1969-12-31 19:00:00.000000000 -0500
+++ libgd-2.2.2/tests/gdimagerotate/bug00067.c	2016-07-18 12:19:19.885423132 -0400
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <float.h>
 #include "gd.h"
 
 #include "gdtest.h"
@@ -41,6 +42,7 @@
 			return 1;
 		}
 
+#if FLT_EVAL_METHOD != 2
 		sprintf(filename, "bug00067_%03d_exp.png", angle);
 		path = gdTestFilePath2("gdimagerotate", filename);
 		if (!gdAssertImageEqualsToFile(path, exp)) {
@@ -48,6 +50,7 @@
 			error += 1;
 		}
 		free(path);
+#endif
 
 		gdImageDestroy(exp);
 	}