build: Only use PKG_INSTALLDIR if available
It's only in pkg-config 0.27 or newer, but 0.25 at least is still fairly widespread.
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@ -68,7 +68,7 @@ AC_LIBTOOL_WIN32_DLL
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AM_PROG_LIBTOOL
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AC_PROG_MAKE_SET
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PKG_PROG_PKG_CONFIG
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PKG_INSTALLDIR
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m4_ifdef([PKG_INSTALLDIR], [PKG_INSTALLDIR], AC_SUBST([pkgconfigdir], ${libdir}/pkgconfig))
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AC_MSG_CHECKING([for RM macro])
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_predefined_rm=`make -p -f /dev/null 2>/dev/null|grep '^RM ='|sed -e 's/^RM = //'`
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