Build failure with gcc 4.7.2

[Maoyin Sun]

Hi there,

I am trying to bootstrap Gentoo Prefix on a very old RHDL machine with gcc
4.7.2. When compiling bison 3.7, it yields:

```
src/parse-simulation.c:64: error: redefinition of typedef 'parse_state'
src/parse-simulation.h:74: note: previous declaration of 'parse_state' was
here
```

The related compile command is:

```
gcc -std=gnu99 -DEXEEXT=\"\"   -I. -I./lib -I. -I./lib
-DINSTALLDIR=\"/opt/risk/tmp/xz4a0b2/gentoo/tmp/usr/bin\"
-I/opt/risk/tmp/xz4a0b2/gentoo/tmp/usr/include -O2 -pipe -O2 -pipe -c -o
src/bison-parse-simulation.o `test -f 'src/parse-simulation.c' || echo
'./'`src/parse-simulation.c
```

The same time I am looking into why Gentoo Prefix does not build a proper
version of gcc before this. But I also checked the build log and it has
detected that only C++98 is supported, which does not allow redefinition of
`typedef`. So I believe that either the configure script should fail, or
the `typedef` redefinition should not be used.

I might be wrong so please tell whether I am operating falsely or this is a
bug.

Best regards,
Maoyin

------------------------------
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So. 2. Aug. 2020 23:17:28 CEST (UTC+2)