gcc: Add GCC option to build on Linux and do not build the texinfo.

- GCC on recent Linux systems needs `-fgnu89-inline` to build.
- Disable building texinfo. Makeinfo on some hosts breaks the build.

Update #3262

source-builder/config/gcc-common-1.cfg

@@ -31,6 +31,16 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
 #
 %global _gcclibdir %{_prefix}/lib
 
+#
+# Update the build flags need to build the older gcc with newer compilers.
+#
+%define build_cflags %{build_cflags} -fgnu89-inline
+
+#
+# Do not build GCC doco, it seems to break with age.
+#
+%define disable_MAKEINFO 1
+
 #
 # Prepare the source code.
 #
@@ -151,6 +161,7 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
     --enable-version-specific-runtime-libs \
     --disable-lto \
     --enable-newlib-io-c99-formats \
+    %{?disable_MAKEINFO:MAKEINFO=missing} \
     %{?with_iconv:--enable-newlib-iconv} \
     %{?with_iconv:--enable-newlib-iconv-encodings=%{_newlib_iconv_encodings}} \
     %{?with_threads:--enable-threads}%{!?with_threads:--disable-threads} \