[libc][bazel] disable epoll_pwait2 (#80362)

Similar to #80051. The epoll_pwait2 syscall isn't available on all
target platforms, and this is causing downstream test failures. This
patch disables it until it can be detected whether or not it is
available.

Author: michaelrj-google

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -3218,12 +3218,14 @@ libc_function(
     ],
 )
 
-libc_function(
-    name = "epoll_pwait2",
-    srcs = ["src/sys/epoll/linux/epoll_pwait2.cpp"],
-    hdrs = ["src/sys/epoll/epoll_pwait2.h"],
-    deps = [
-        ":__support_osutil_syscall",
-        ":errno",
-    ],
-)
+#TODO: Enable once epoll_pwait2 availablilty can be checked first.
+# https://github.com/llvm/llvm-project/issues/80060
+# libc_function(
+#     name = "epoll_pwait2",
+#     srcs = ["src/sys/epoll/linux/epoll_pwait2.cpp"],
+#     hdrs = ["src/sys/epoll/epoll_pwait2.h"],
+#     deps = [
+#         ":__support_osutil_syscall",
+#         ":errno",
+#     ],
+# )

utils/bazel/llvm-project-overlay/libc/test/src/sys/epoll/BUILD.bazel

@@ -26,10 +26,12 @@ libc_test(
     ],
 )
 
-libc_test(
-    name = "epoll_pwait2_test",
-    srcs = ["linux/epoll_pwait2_test.cpp"],
-    libc_function_deps = [
-        "//libc:epoll_pwait2",
-    ],
-)
+#TODO: Enable once epoll_pwait2 availablilty can be checked first.
+# https://github.com/llvm/llvm-project/issues/80060
+# libc_test(
+#     name = "epoll_pwait2_test",
+#     srcs = ["linux/epoll_pwait2_test.cpp"],
+#     libc_function_deps = [
+#         "//libc:epoll_pwait2",
+#     ],
+# )