Revert "fix: export zlib symbols (#15103)" (#15138)

This reverts commit 47b12eee57.

patches/common/zlib/.patches.yaml

@@ -1,7 +0,0 @@
-repo: src
-patches:
--
-  author: Andy Dill <adill@discordapp.com>
-  file: fix-export_zlib_symbols.patch
-  description: |
-    Set ZLIB_DLL so that we export zlib symbols.

patches/common/zlib/fix-export_zlib_symbols.patch

@@ -1,15 +0,0 @@
-diff --git a/third_party/zlib/BUILD.gn b/third_party/zlib/BUILD.gn
-index 902e287f8a0a..c08a187ca968 100644
---- a/third_party/zlib/BUILD.gn
-+++ b/third_party/zlib/BUILD.gn
-@@ -265,6 +265,10 @@ static_library("zlib") {
-   defines = []
-   deps = []
-
-+  if (is_win) {
-+    defines += [ "ZLIB_DLL" ]
-+  }
-+
-   if (!is_ios && (current_cpu == "x86" || current_cpu == "x64")) {
-     deps += [ ":zlib_crc32_simd" ]
-