lcms: Sanitize floating point read

third_party/lcms2-2.6/0015-sanitize-float-read.patch

Index: third_party/lcms2-2.6/0015-sanitize-float-read.patch
diff --git a/third_party/lcms2-2.6/0015-sanitize-float-read.patch b/third_party/lcms2-2.6/0015-sanitize-float-read.patch
new file mode 100644
index 0000000000000000000000000000000000000000..5171eee6f56870e744a92f7c2950295acf8bd6ff
--- /dev/null
+++ b/third_party/lcms2-2.6/0015-sanitize-float-read.patch
@@ -0,0 +1,15 @@
+diff --git a/third_party/lcms2-2.6/src/cmsplugin.c b/third_party/lcms2-2.6/src/cmsplugin.c
+index b95befb..4ba998b 100644
+--- a/third_party/lcms2-2.6/src/cmsplugin.c
++++ b/third_party/lcms2-2.6/src/cmsplugin.c
+@@ -182,7 +182,9 @@ cmsBool CMSEXPORT  _cmsReadFloat32Number(cmsIOHANDLER* io, cmsFloat32Number* n)
+         if (isnan(*n))
+             return FALSE;
+     }
+-    return TRUE;
++
++    // fpclassify() required by C99
++    return ((fpclassify(*n) == FP_ZERO) || (fpclassify(*n) == FP_NORMAL));
+ }
+ 
+