Remove support for pre-C89 libc versions that lack memcpy,

memmove, and memset.

configure.ac

@@ -444,7 +444,7 @@ gl_GETOPT
 
 # Functions that are not mandatory i.e. we have alternatives for them
 # or we can just drop some functionality:
-AC_CHECK_FUNCS([memcpy memmove memset futimes futimesat])
+AC_CHECK_FUNCS([futimes futimesat])
 
 # Check how to find out the amount of physical memory in the system. The
 # lzma command line tool uses this to automatically limits its memory usage.

src/common/sysdefs.h

@@ -132,19 +132,8 @@ typedef unsigned char _Bool;
 // Macros //
 ////////////
 
-#ifndef HAVE_MEMCPY
-#	define memcpy(dest, src, n) bcopy(src, dest, n)
-#endif
-
-#ifndef HAVE_MEMMOVE
-#	define memmove(dest, src, n) bcopy(src, dest, n)
-#endif
-
-#ifdef HAVE_MEMSET
+#undef memzero
 #define memzero(s, n) memset(s, 0, n)
-#else
-#	define memzero(s, n) bzero(s, n)
-#endif
 
 #ifndef MIN
 #	define MIN(x, y) ((x) < (y) ? (x) : (y))

src/liblzma/common/allocator.c

@@ -35,7 +35,7 @@ lzma_alloc(size_t size, lzma_allocator *allocator)
 	else
 		ptr = malloc(size);
 
-#if !defined(NDEBUG) && defined(HAVE_MEMSET)
+#ifndef NDEBUG
 	// This helps to catch some stupid mistakes, but also hides them from
 	// Valgrind. Uncomment when useful.
 // 	if (ptr != NULL)