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 Avoids the following message: ``` configure.ac:23: warning: The macro `AC_PROG_CC_C89' is obsolete.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`.
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@ -38,8 +38,7 @@ AC_PATH_TOOL(AR, ar)
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AC_PATH_TOOL(RANLIB, ranlib)
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AC_PATH_TOOL(RANLIB, ranlib)
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AC_PATH_TOOL(STRIP, strip)
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AC_PATH_TOOL(STRIP, strip)
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AM_PROG_CC_C_O
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AC_PROG_CC
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AC_PROG_CC_C89
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if test x"$ac_cv_prog_cc_c89" = x"no"; then
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if test x"$ac_cv_prog_cc_c89" = x"no"; then
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AC_MSG_ERROR([c89 compiler support required])
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AC_MSG_ERROR([c89 compiler support required])
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fi
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fi
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