Improve cosmocc toolchain

- Decouple zlib from libc
- Add some underscores to mostly internal names

third_party/puff/README.cosmo

@@ -0,0 +1,18 @@
+DESCRIPTION
+
+  puff is a tiny implementation of deflate decompression
+
+LICENSE
+
+  zlib license
+
+ORIGIN
+
+  Origin: git@github.com:madler/zlib.git
+  Commit: 03614c56ad299f9b238c75aa1e66f0c08fc4fc8b
+  Author: Mark Adler <madler@alumni.caltech.edu>
+  Date:   Sun Oct 30 08:36:13 2016 -0700
+
+LOCAL CHANGES
+
+  None.

third_party/puff/puff.c

@@ -23,7 +23,7 @@
 │  Mark Adler    madler@alumni.caltech.edu                                     │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/runtime/runtime.h"
-#include "third_party/zlib/puff.h"
+#include "third_party/puff/puff.h"
 // clang-format off
 
 asm(".ident\t\"\\n\\n\
@@ -825,10 +825,10 @@ local int dynamic(struct state *s)
  *   block (if it was a fixed or dynamic block) are undefined and have no
  *   expected values to check.
  */
-int puff(unsigned char *dest,           /* pointer to destination pointer */
-         unsigned long *destlen,        /* amount of output space */
-         const unsigned char *source,   /* pointer to source data pointer */
-         unsigned long *sourcelen)      /* amount of input available */
+int _puff(unsigned char *dest,           /* pointer to destination pointer */
+          unsigned long *destlen,        /* amount of output space */
+          const unsigned char *source,   /* pointer to source data pointer */
+          unsigned long *sourcelen)      /* amount of input available */
 {
     struct state s;             /* input/output state */
     int last, type;             /* block information */

third_party/puff/puff.h

@@ -7,8 +7,8 @@ COSMOPOLITAN_C_START_
 #define NIL ((unsigned char *)0) /* for no output option */
 #endif
 
-int puff(unsigned char *dest, unsigned long *destlen,
-         const unsigned char *source, unsigned long *sourcelen);
+int _puff(unsigned char *dest, unsigned long *destlen,
+          const unsigned char *source, unsigned long *sourcelen);
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */

third_party/puff/puff.mk

@@ -0,0 +1,45 @@
+#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
+#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
+
+PKGS += THIRD_PARTY_PUFF
+
+THIRD_PARTY_PUFF_ARTIFACTS += THIRD_PARTY_PUFF_A
+THIRD_PARTY_PUFF = $(THIRD_PARTY_PUFF_A_DEPS) $(THIRD_PARTY_PUFF_A)
+THIRD_PARTY_PUFF_A = o/$(MODE)/third_party/puff/puff.a
+THIRD_PARTY_PUFF_A_FILES := $(wildcard third_party/puff/*)
+THIRD_PARTY_PUFF_A_HDRS = $(filter %.h,$(THIRD_PARTY_PUFF_A_FILES))
+THIRD_PARTY_PUFF_A_SRCS = $(filter %.c,$(THIRD_PARTY_PUFF_A_FILES))
+
+THIRD_PARTY_PUFF_A_OBJS =			\
+	$(THIRD_PARTY_PUFF_A_SRCS:%.c=o/$(MODE)/%.o)
+
+THIRD_PARTY_PUFF_A_CHECKS =			\
+	$(THIRD_PARTY_PUFF_A).pkg		\
+	$(THIRD_PARTY_PUFF_A_HDRS:%=o/$(MODE)/%.ok)
+
+THIRD_PARTY_PUFF_A_DIRECTDEPS =			\
+	LIBC_INTRIN				\
+	LIBC_NEXGEN32E				\
+	LIBC_STUBS
+
+THIRD_PARTY_PUFF_A_DEPS :=			\
+	$(call uniq,$(foreach x,$(THIRD_PARTY_PUFF_A_DIRECTDEPS),$($(x))))
+
+$(THIRD_PARTY_PUFF_A):				\
+		third_party/puff/		\
+		$(THIRD_PARTY_PUFF_A).pkg	\
+		$(THIRD_PARTY_PUFF_A_OBJS)
+
+$(THIRD_PARTY_PUFF_A).pkg:			\
+		$(THIRD_PARTY_PUFF_A_OBJS)	\
+		$(foreach x,$(THIRD_PARTY_PUFF_A_DIRECTDEPS),$($(x)_A).pkg)
+
+THIRD_PARTY_PUFF_LIBS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)))
+THIRD_PARTY_PUFF_SRCS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_SRCS))
+THIRD_PARTY_PUFF_HDRS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_HDRS))
+THIRD_PARTY_PUFF_CHECKS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_CHECKS))
+THIRD_PARTY_PUFF_OBJS = $(foreach x,$(THIRD_PARTY_PUFF_ARTIFACTS),$($(x)_OBJS))
+
+.PHONY: o/$(MODE)/third_party/puff
+o/$(MODE)/third_party/puff:			\
+		$(THIRD_PARTY_PUFF_CHECKS)

third_party/third_party.mk

@@ -23,6 +23,7 @@ o/$(MODE)/third_party:				\
 	o/$(MODE)/third_party/mbedtls		\
 	o/$(MODE)/third_party/musl		\
 	o/$(MODE)/third_party/nsync		\
+	o/$(MODE)/third_party/puff		\
 	o/$(MODE)/third_party/python		\
 	o/$(MODE)/third_party/quickjs		\
 	o/$(MODE)/third_party/regex		\