remove -weak_framework (#89233)

Summary:
X-link: pytorch/pytorch#89233

The `-weak_framework` flag is no longer necessary, Buck will weakly link frameworks depending on the `target_sdk_version` of the binary being linked.

Reviewed By: ebgraham, malfet

Differential Revision: D41348639

fbshipit-source-id: 47992282ba030294b2304c550d49df13e24e9c79

BUCK

@@ -406,12 +406,6 @@ rn_apple_xplat_cxx_library(
         "-Wno-global-constructors",
     ],
     contacts = ["[email protected]"],
-    exported_linker_flags = [
-        "-weak_framework",
-        "UserNotifications",
-        "-weak_framework",
-        "WebKit",
-    ],
     exported_preprocessor_flags = rn_extra_build_flags(),
     fbobjc_enable_exceptions = True,
     frameworks = [
@@ -426,6 +420,7 @@ rn_apple_xplat_cxx_library(
         "$SDKROOT/System/Library/Frameworks/SystemConfiguration.framework",
         "$SDKROOT/System/Library/Frameworks/UIKit.framework",
         "$SDKROOT/System/Library/Frameworks/UserNotifications.framework",
+        "$SDKROOT/System/Library/Frameworks/WebKit.framework",
     ],
     labels = [
         "depslint_never_add",

React/CoreModules/BUCK

@@ -22,17 +22,13 @@ rn_apple_library(
     ],
     contacts = ["[email protected]"],
     enable_exceptions = True,
-    exported_linker_flags = [
-        "-weak_framework",
-        "UserNotifications",
-        "-weak_framework",
-        "WebKit",
-    ],
     exported_preprocessor_flags = rn_extra_build_flags(),
     extension_api_only = True,
     frameworks = [
         "Foundation",
         "UIKit",
+        "UserNotifications",
+        "WebKit",
     ],
     header_path_prefix = "React",
     labels = [