[autoconf] Fix 80+ and quoting.

Additional quoting for safety and satisfying newer autotools.  Fix a couple of 80 column violations.

http://llvm-reviews.chandlerc.com/D333

Signed-off-by: Saleem Abdulrasool <compnerd@compnerd.org>
[autoconf] Fix m4 quoting for newer autotools

This simply fixes up quoting of macro invocations to appease newer versions of autotools.

http://llvm-reviews.chandlerc.com/D332

Signed-off-by: Saleem Abdulrasool <compnerd@compnerd.org>
[autoconf]: Fix description in HAVE_CRASHREPORTER_INFO.

http://llvm-reviews.chandlerc.com/D332

Signed-off-by: Saleem Abdulrasool <compnerd@compnerd.org>