Remove unnecessary icc version checks

With unknown attribute warnings disabled, these checks are no
longer needed.  Removing them improves readability while having
no effect on generated code.
Signed-off-by: NMans Rullgard <mans@mansr.com>

libavutil/attributes.h

@@ -65,7 +65,7 @@
 #endif
 
 #ifndef av_cold
-#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
+#if AV_GCC_VERSION_AT_LEAST(4,3)
 #    define av_cold __attribute__((cold))
 #else
 #    define av_cold
@@ -73,7 +73,7 @@
 #endif
 
 #ifndef av_flatten
-#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,1)
+#if AV_GCC_VERSION_AT_LEAST(4,1)
 #    define av_flatten __attribute__((flatten))
 #else
 #    define av_flatten
@@ -110,7 +110,7 @@
 #endif
 
 #ifndef av_alias
-#if (!defined(__ICC) || __ICC > 1200) && AV_GCC_VERSION_AT_LEAST(3,3)
+#if AV_GCC_VERSION_AT_LEAST(3,3)
 #   define av_alias __attribute__((may_alias))
 #else
 #   define av_alias

libavutil/internal.h

@@ -39,7 +39,7 @@
 #include "timer.h"
 
 #ifndef attribute_align_arg
-#if ARCH_X86_32 && (!defined(__ICC) || __ICC > 1200) && AV_GCC_VERSION_AT_LEAST(4,2)
+#if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
 #    define attribute_align_arg __attribute__((force_align_arg_pointer))
 #else
 #    define attribute_align_arg

libavutil/mem.h

@@ -56,7 +56,7 @@
     #define av_malloc_attrib
 #endif
 
-#if (!defined(__ICC) || __ICC > 1200) && AV_GCC_VERSION_AT_LEAST(4,3)
+#if AV_GCC_VERSION_AT_LEAST(4,3)
     #define av_alloc_size(n) __attribute__((alloc_size(n)))
 #else
     #define av_alloc_size(n)