Remove AM_PROG_AR. With AM_PROG_AR may report "error: possibly underfined macro: AM_PROG_AR" (mingw, autoreconf-2.68). Without AM_PROG_AR may report warning "archiver requires 'AM_PROG_AR' in 'configure.ac'" (cygwin, automake-1.12). They do not affect the tests and install
Remove AM_PROG_AR.
With AM_PROG_AR may report "error: possibly underfined macro: AM_PROG_AR" (mingw, autoreconf-2.68).
Without AM_PROG_AR may report warning "archiver requires 'AM_PROG_AR' in 'configure.ac'" (cygwin, automake-1.12).
They do not affect the tests and install


git-svn-id: 6df6fa3ddd728f578ea1442598151d5900a6ed44@545 630680e5-0e50-0410-840e-4b1c322b438d

svn2github/protobuf-mirror,svn2github/protobuf-mirror,da2ce7/protobuf,svn2github/protobuf-mirror,svn2github/google-protobuf,da2ce7/protobuf,svn2github/google-protobuf,svn2github/google-protobuf,svn2github/google-protobuf,da2ce7/protobuf,svn2github/protobuf-mirror,svn2github/protobuf-mirror,svn2github/google-protobuf,da2ce7/protobuf,da2ce7/protobuf