[FYI] Merged msvc into master

[Stefano Lattarini]

commit 38e1b39d77ad4a22c85d5ad7b2fde4fd51bfd1b5
Merge: a778e9e 2270535
Author:     Stefano Lattarini <address@hidden>
AuthorDate: Thu Nov 3 13:50:06 2011 +0100
Commit:     Stefano Lattarini <address@hidden>
CommitDate: Thu Nov 3 14:36:42 2011 +0100

    Merge branch 'msvc' into master
    
    Commits merged from msvc:
     - tests: few improvements to some `ar-lib' related tests
     - warnings: new 'extra-portability' category, for AM_PROG_AR
     - ar-lib: new 'AM_PROG_AR' macro, triggering the 'ar-lib' script
    
    Extra changes required by the testsuite:
    * tests/instspc-tests.sh: Adjust to new portability requirements
    due to the new AM_PROG_AR macro.
    * tests/libobj-basic.test: Likewise.
    * tests/libobj2.test: Likewise.
    * tests/libobj15a.test: Likewise.
    * tests/libobj15b.test: Likewise.
    * tests/libobj15c.test: Likewise.
    * tests/libobj16a.test: Likewise.
    * tests/libobj16b.test: Likewise.
    * tests/libobj17.test: Likewise.
    * tests/libobj18.test: Likewise.
    * tests/libobj19.test: Likewise.
    * tests/libobj20a.test: Likewise.
    * tests/libobj20b.test: Likewise.
    * tests/libobj20c.test: Likewise.
    * tests/canon6.test: Likewise.
    * tests/canon6.test: Likewise.
    * tests/canon7.tests: Likewise.
    * tests/extra9.test: Likewise.
    * tests/extradep.test: Likewise.
    * tests/extradep2.test: Likewise.
    * tests/posixsubst-ldadd.test: Likewise.
    * tests/posixsubst-libraries.test: Likewise.
    * tests/posixsubst-ltlibraries.test: Likewise.
    * tests/python-virtualenv.test: Likewise.
    * tests/vartypos.test: Likewise.
    * tests/vartypo2.test: Likewise.
    * tests/suffix.test: Update to take into account previous
    master-only changes.
    * tests/suffix2.test: Likewise.
    * tests/libobj7.test: Call automake with the `--add-missing'
    option, instead of creating a dummy `ar-lib' file, since this
    test now also runs "./configure" and "make".
    * tests/suffix5.test: Copy the real `ar-lib' script file,
    instead of creating a dummy one, since this test now also
    runs "./configure" and "make".
    * tests/extra-portability2.test: Fix this test not to rely
    on the older, faulty semantics of "strictness specification
    always reset warning level", which has been fixed in commit
    v1.11-623-g1609491 (see also automake bug#7669 a.k.a. PR/547).
    Since we are at it, throw inf few other minor unrelated
    improvements.
    * tests/extra-portability.test: Explicitly pass `-Wall' to
    automake calls, for clarity.