Fold conv package into fmt

Both packages had nearly identical dependency requirements, so merging
them should help reduce the complexity of the build graph.

tool/hash/crctab.c

@@ -18,7 +18,7 @@
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/bits/bits.h"
-#include "libc/conv/conv.h"
+#include "libc/fmt/conv.h"
 #include "libc/macros.h"
 #include "libc/nexgen32e/crc32.h"
 #include "libc/runtime/runtime.h"

tool/hash/hash.mk

@@ -17,11 +17,10 @@ TOOL_HASH_BINS =				\
 	$(TOOL_HASH_COMS:%=%.dbg)
 
 TOOL_HASH_DIRECTDEPS =				\
-	LIBC_CONV				\
-	LIBC_STR				\
 	LIBC_FMT				\
 	LIBC_NEXGEN32E				\
 	LIBC_RUNTIME				\
+	LIBC_STR				\
 	LIBC_STUBS				\
 	LIBC_STDIO