Remove lint support from system headers and MD x86 headers.

Reviewed by:	dim, jhb
Discussed with:	imp
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D13156

newlib/libc/include/sys/cdefs.h

@@ -227,17 +227,6 @@
  * for a given compiler, let the compile fail if it is told to use
  * a feature that we cannot live without.
  */
-#ifdef lint
-#define	__dead2
-#define	__pure2
-#define	__unused
-#define	__packed
-#define	__aligned(x)
-#define	__alloc_align(x)
-#define	__alloc_size(x)
-#define	__section(x)
-#define	__weak_symbol
-#else
 #define	__weak_symbol	__attribute__((__weak__))
 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
 #define	__dead2
@@ -269,7 +258,6 @@
 #else
 #define	__alloc_align(x)
 #endif
-#endif /* lint */
 
 #if !__GNUC_PREREQ__(2, 95)
 #define	__alignof(x)	__offsetof(struct { char __a; x __b; }, __b)
@@ -279,7 +267,7 @@
  * Keywords added in C11.
  */
 
-#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint)
+#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
 
 #if !__has_extension(c_alignas)
 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
@@ -438,7 +426,7 @@
  * software that is unaware of C99 keywords.
  */
 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
-#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
+#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
 #define	__restrict
 #else
 #define	__restrict	restrict
@@ -654,7 +642,7 @@
  */
 
 #if __has_attribute(__argument_with_type_tag__) && \
-    __has_attribute(__type_tag_for_datatype__) && !defined(lint)
+    __has_attribute(__type_tag_for_datatype__)
 #define	__arg_type_tag(arg_kind, arg_idx, type_tag_idx) \
 	    __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx)))
 #define	__datatype_type_tag(kind, type) \