[bazel] Port #150303 (#150351)

Author: rupprecht

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

@@ -51,6 +51,7 @@ libc_test_library(
         "//libc:__support_macros_properties_complex_types",
         "//libc:__support_macros_properties_types",
         "//libc:hdr_math_macros",
+        "//libc:hdr_stdint_proxy",
         "//libc/test/UnitTest:LibcUnitTest",
         "//libc/test/UnitTest:fp_test_helpers",
         "//libc/utils/MPFRWrapper:mp_common",