Port musl to x86-64. One giant commit!

arch/x86_64/bits/limits.h

@@ -0,0 +1,32 @@
+#define PIPE_BUF 4096
+#define PAGESIZE 4096
+#define PAGE_SIZE PAGESIZE
+#define FILESIZEBITS 64
+#define NAME_MAX 255
+#define SYMLINK_MAX 255
+#define PATH_MAX 4096
+#define NZERO 20
+#define NGROUPS_MAX 32
+#define ARG_MAX 131072
+#define IOV_MAX 1024
+#define SYMLOOP_MAX 40
+
+#define WORD_BIT 64
+#define LONG_BIT 64
+
+#define SHRT_MIN  (-1-0x7fff)
+#define SHRT_MAX  0x7fff
+#define USHRT_MAX 0xffff
+
+#define INT_MIN  (-1-0x7fffffff)
+#define INT_MAX  0x7fffffff
+#define UINT_MAX 0xffffffff
+
+#define LONG_MIN  (-1-0x7fffffffffffffffL)
+#define LONG_MAX  0x7fffffffffffffffL
+#define ULONG_MAX 0xffffffffffffffffL
+
+#define LLONG_MIN  (-1-0x7fffffffffffffffLL)
+#define LLONG_MAX  0x7fffffffffffffffLL
+#define ULLONG_MAX 0xffffffffffffffffULL
+