backout r2833: CURDIR was set to Unix style path

instead, do chdir inside Makefile

auto/lib/zlib/make

@@ -7,17 +7,20 @@ case "$NGX_CC_NAME" in
     msvc*)
         ngx_makefile=makefile.msvc
         ngx_opt="CPU_OPT=\"$CPU_OPT\" LIBC=$LIBC"
+        ngx_zlib="ZLIB=\"$ZLIB\""
 
     ;;
 
     owc*)
         ngx_makefile=makefile.owc
         ngx_opt="CPU_OPT=\"$CPU_OPT\""
+        ngx_zlib=`echo ZLIB=\"$ZLIB\" | sed -e "s/\//$ngx_regex_dirsep/g"`
     ;;
 
     bcc)
         ngx_makefile=makefile.bcc
         ngx_opt="-DCPU_OPT=\"$CPU_OPT\""
+        ngx_zlib=`echo \-DZLIB=\"$ZLIB\" | sed -e "s/\//$ngx_regex_dirsep/g"`
     ;;
 
 esac
@@ -29,14 +32,10 @@ done=NO
 case "$NGX_PLATFORM" in
 
     win32)
-        cp auto/lib/zlib/$ngx_makefile $ZLIB
-
         cat << END                                            >> $NGX_MAKEFILE
 
 `echo "$ZLIB/zlib.lib:	$NGX_MAKEFILE" | sed -e "s/\//$ngx_regex_dirsep/g"`
-	cd `echo $ZLIB | sed -e "s/\//$ngx_regex_dirsep/g"`
-	\$(MAKE) -f $ngx_makefile $ngx_opt
-	cd \$(CURDIR)
+	\$(MAKE) -f auto/lib/zlib/$ngx_makefile $ngx_opt $ngx_zlib
 
 END
 

auto/lib/zlib/makefile.bcc

@@ -5,6 +5,8 @@
 CFLAGS = -q -O2 -tWM -w-8004 -w-8012 $(CPU_OPT)
 
 zlib.lib:
+	cd $(ZLIB)
+
 	bcc32 -c $(CFLAGS) adler32.c crc32.c deflate.c trees.c zutil.c \
 		compress.c
 

auto/lib/zlib/makefile.msvc

@@ -5,6 +5,8 @@
 CFLAGS = -nologo -O2 -Ob1 -Oi -Gs $(LIBC) $(CPU_OPT)
 
 zlib.lib:
+	cd $(ZLIB)
+
 	cl -c $(CFLAGS) adler32.c crc32.c deflate.c trees.c zutil.c compress.c
 
 	link -lib -out:zlib.lib adler32.obj crc32.obj deflate.obj \

auto/lib/zlib/makefile.owc

@@ -5,5 +5,7 @@
 CFLAGS = -zq -bt=nt -ot -op -oi -oe -s -bm $(CPU_OPT)
 
 zlib.lib:
+	cd $(ZLIB)
+
 	wcl386 -c $(CFLAGS) adler32.c crc32.c deflate.c trees.c zutil.c compress.c
 	wlib -n zlib.lib adler32.obj crc32.obj deflate.obj trees.obj zutil.obj compress.obj