No longer needed call to AC_PROG_CXX_FOR_BUILD in configure.ac

[Arfrever]

protobuf/configure.ac

Line 78 in c740572

AC_PROG_CXX_FOR_BUILD

This was introduced in commit b40d318 (by @acozzette) on 2017-01-03 along with m4/ax_prog_cc_for_build.m4 and m4/ax_prog_cxx_for_build.m4 files (copied from GNU Autoconf Archive project).

However commit b3e4e3a (by @xfxyjwf) on 2018-06-01 deleted usage of CXX_FOR_BUILD variable in src/Makefile.am. No other usage of *_FOR_BUILD variables remains.

So call to AC_PROG_CXX_FOR_BUILD macro in configure.ac and m4/ax_prog_cc_for_build.m4 and m4/ax_prog_cxx_for_build.m4 files are now useless and should be deleted.

[Arfrever]

Also issue #3141 will become obsolete afterwards.

[Arfrever]

@acozzette: Ping.

--- a/configure.ac
+++ b/configure.ac
@@ -75,7 +75,6 @@
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_CXX
-AC_PROG_CXX_FOR_BUILD
 AC_LANG([C++])
 ACX_USE_SYSTEM_EXTENSIONS
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])

Followed by git rm m4/ax_prog_cc_for_build.m4 m4/ax_prog_cxx_for_build.m4.

[xen0n]

Drive-by triage (while trying to bump the Gentoo package): this is no longer relevant since #10132 removed the autotools machinery.

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