Fold conv package into fmt

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

libc/stdio/fread.c

@@ -17,8 +17,8 @@
 │ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/conv/conv.h"
 #include "libc/errno.h"
+#include "libc/fmt/conv.h"
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/internal.h"
 #include "libc/stdio/stdio.h"

libc/stdio/stdio.mk

@@ -29,15 +29,14 @@ LIBC_STDIO_A_DIRECTDEPS =				\
 	LIBC_BITS					\
 	LIBC_CALLS					\
 	LIBC_CALLS_HEFTY				\
-	LIBC_CONV					\
 	LIBC_FMT					\
 	LIBC_MEM					\
 	LIBC_NEXGEN32E					\
-	LIBC_STUBS					\
-	LIBC_STR					\
+	LIBC_NT_KERNELBASE				\
 	LIBC_RAND					\
 	LIBC_RUNTIME					\
-	LIBC_NT_KERNELBASE				\
+	LIBC_STR					\
+	LIBC_STUBS					\
 	LIBC_SYSV					\
 	LIBC_SYSV_CALLS