argyllcms: delete gcc5 patch

pkgs/tools/graphics/argyllcms/gcc5.patch

@@ -1,20 +0,0 @@
-Description: Fix FTBFS with GCC 5
-Author: James Cowgill <james410@cowgill.org.uk>
-Bug-Debian: https://bugs.debian.org/777779
-Forwarded: no
----
-This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
---- a/icc/icc.h
-+++ b/icc/icc.h
-@@ -100,7 +100,11 @@
- #define CF64PREC "LL"		/* Constant precision specifier */
- 
- #ifndef ATTRIBUTE_NORETURN
-+#ifdef _MSC_VER
- # define ATTRIBUTE_NORETURN __declspec(noreturn)
-+#else
-+# define ATTRIBUTE_NORETURN __attribute__((noreturn))
-+#endif
- #endif
- 
- #else  /* !__STDC_VERSION__ */