Fold conv package into fmt

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

third_party/lex/buf.c

@@ -42,7 +42,7 @@
 #include "libc/mem/mem.h"
 #include "libc/fmt/fmt.h"
 #include "libc/math.h"
-#include "libc/conv/conv.h"
+#include "libc/fmt/conv.h"
 #include "flexdef.h"
 
 /* Take note: The buffer object is sometimes used as a String buffer (one

third_party/lex/lex.mk

@@ -60,7 +60,6 @@ THIRD_PARTY_LEX_DIRECTDEPS =				\
 	LIBC_ALG					\
 	LIBC_CALLS					\
 	LIBC_CALLS_HEFTY				\
-	LIBC_CONV					\
 	LIBC_FMT					\
 	LIBC_LOG					\
 	LIBC_MATH					\

third_party/lex/main.c

@@ -50,7 +50,7 @@ asm(".include \"third_party/lex/COPYING\"");
 #include "libc/str/str.h"
 #include "libc/mem/mem.h"
 #include "libc/math.h"
-#include "libc/conv/conv.h"
+#include "libc/fmt/conv.h"
 #include "libc/log/log.h"
 #include "libc/runtime/gc.h"
 #include "libc/x/x.h"

third_party/lex/regex.c

@@ -31,7 +31,7 @@
 #include "libc/str/str.h"
 #include "libc/mem/mem.h"
 #include "libc/fmt/fmt.h"
-#include "libc/conv/conv.h"
+#include "libc/fmt/conv.h"
 #include "flexdef.h"
 
 

third_party/lex/scanopt.c

@@ -39,7 +39,7 @@
 
 #include "flexdef.h"
 #include "libc/str/str.h"
-#include "libc/conv/conv.h"
+#include "libc/fmt/conv.h"
 #include "libc/mem/mem.h"
 #include "libc/str/str.h"
 #include "libc/str/str.h"

third_party/lex/tables.c

@@ -1,7 +1,7 @@
 /*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8   -*-│
 │vi: set et ft=c ts=8 sw=8 fenc=utf-8                                       :vi│
 └─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/conv/conv.h"
+#include "libc/fmt/conv.h"
 #include "libc/mem/mem.h"
 #include "libc/sock/sock.h"
 #include "libc/str/str.h"