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/calc/calc.c

@@ -21,8 +21,8 @@
 #include "libc/bits/bswap.h"
 #include "libc/bits/safemacros.internal.h"
 #include "libc/calls/calls.h"
-#include "libc/conv/conv.h"
 #include "libc/errno.h"
+#include "libc/fmt/conv.h"
 #include "libc/log/log.h"
 #include "libc/macros.h"
 #include "libc/math.h"

tool/calc/calc.mk

@@ -27,16 +27,15 @@ TOOL_CALC_CHECKS =				\
 TOOL_CALC_DIRECTDEPS =				\
 	LIBC_BITS				\
 	LIBC_CALLS				\
-	LIBC_CONV				\
-	LIBC_LOG				\
 	LIBC_FMT				\
+	LIBC_LOG				\
 	LIBC_MEM				\
 	LIBC_NEXGEN32E				\
 	LIBC_RAND				\
 	LIBC_RUNTIME				\
 	LIBC_STDIO				\
-	LIBC_STUBS				\
 	LIBC_STR				\
+	LIBC_STUBS				\
 	LIBC_SYSV				\
 	LIBC_TINYMATH				\
 	LIBC_X					\