Use 64-bit years

This change makes strftime() go faster and makes it possible to format
timestamps through the big bang to most of the stelliferous era. India
has also been added as a timezone to most binaries. Since we were able
to change the struct tm abi, this makes cosmopolitan libc superior, to
just about everything else, when it comes to standing the test of time

libc/fmt/conv.h

@@ -83,13 +83,13 @@ typedef struct {
 } div_t;
 
 typedef struct {
-  long int quot;
-  long int rem;
+  long quot;
+  long rem;
 } ldiv_t;
 
 typedef struct {
-  long long int quot;
-  long long int rem;
+  long long quot;
+  long long rem;
 } lldiv_t;
 
 typedef struct {