laanwj e0db3f8a25 build: Replace use of deprecated autoconf macro AC_PROG_CC_C89 ...

According to [autoconf 2.70](https://www.gnu.org/software/autoconf/manual/autoconf-2.70/html_node/Obsolete-Macros.html)
documentation, the `AC_PROG_CC_C89' is replaced by `AC_PROG_CC`, which
defines the same variable `ac_cv_prog_cc_c89`.

Avoids the following message:
```
configure.ac:23: warning: The macro `AC_PROG_CC_C89' is obsolete.
```

Also, remove deprecated `AM_PROG_CC_C_O`.

2022-02-03 08:57:36 +01:00

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