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[gzip] Support `gzip' encoded header conditionally.

In order to support `gzip' encoded header the call to
`inflateInit2' was modified in commit 6a92b1fadde26477a9179.
However, this code breaks with the outdated internal version
of zlib.  This is a temporary fix to conditionally support
`gzip' encoded header whenever a system installation of zlib
is being used.

Problem report in

  https://lists.nongnu.org/archive/html/freetype-devel/2020-02/msg00023.html

* src/gzip/ftgzip.c (FT_Gzip_Uncompress): Change the the call to
`inflateInit2' depending on whether the system installation is
being used or the internal copy.

git/fs: mount .git/fs: mount/attach disallowed

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,3 +1,22 @@

+2020-03-02  Moazin Khatti  <moazinkhatri@gmail.com>

+

+	[gzip] Support `gzip' encoded header conditionally.

+

+	In order to support `gzip' encoded header the call to

+	`inflateInit2' was modified in commit 6a92b1fadde26477a9179.

+	However, this code breaks with the outdated internal version

+	of zlib.  This is a temporary fix to conditionally support

+	`gzip' encoded header whenever a system installation of zlib

+	is being used.

+

+	Problem report in

+

+	  https://lists.nongnu.org/archive/html/freetype-devel/2020-02/msg00023.html

+

+	* src/gzip/ftgzip.c (FT_Gzip_Uncompress): Change the the call to

+	`inflateInit2' depending on whether the system installation is

+	being used or the internal copy.

+

 2020-02-29  Ben Wagner  <bungeman@google.com>

 	[truetype] Fix state of `FT_Face' for buggy `gvar' tables (#57923).

--- a/src/gzip/ftgzip.c

+++ b/src/gzip/ftgzip.c

@@ -746,7 +746,17 @@

     stream.zfree  = (free_func) ft_gzip_free;

     stream.opaque = memory;

+    /* This is a temporary fix and will be removed once the internal

+     * copy of zlib is updated to the newest version. The `|32' flag

+     * is only supported in the new versions of zlib to enable gzip

+     * encoded header.

+     */

+#ifdef FT_CONFIG_OPTION_SYSTEM_ZLIB

     err = inflateInit2( &stream, MAX_WBITS|32 );

+#else

+    err = inflateInit2( &stream, MAX_WBITS );

+#endif

+

     if ( err != Z_OK )

       return FT_THROW( Invalid_Argument );