8319268: Build failure with GCC8.3.1 after 8313643

Reviewed-by: jiefu, erikj, prr

Author: xpbob

make/modules/java.desktop/lib/Awt2dLibraries.gmk

@@ -504,7 +504,9 @@ else
        unused-result array-bounds parentheses
    # noexcept-type required for GCC 7 builds. Not required for GCC 8+.
    # expansion-to-defined required for GCC 9 builds. Not required for GCC 10+.
-   HARFBUZZ_DISABLED_WARNINGS_CXX_gcc := class-memaccess noexcept-type expansion-to-defined dangling-reference
+   # maybe-uninitialized required for GCC 8 builds. Not required for GCC 9+.
+   HARFBUZZ_DISABLED_WARNINGS_CXX_gcc := class-memaccess noexcept-type \
+       expansion-to-defined dangling-reference maybe-uninitialized
    HARFBUZZ_DISABLED_WARNINGS_clang := missing-field-initializers range-loop-analysis
    HARFBUZZ_DISABLED_WARNINGS_microsoft := 4267 4244