flex-2.6.4-160000.2.2

- Use %autosetup macro. Allows to eliminate the usage of deprecated
  PatchN.

- stop installing COPYING into docdir (already in licensedir)

- Update project url

- Enable profile guided optimization during build

- Fix RPM categories.

- use-extensions.patch: add AC_USE_SYSTEM_EXTENSIONS to get missing
  declaration

- Explicitly require m4 and library devel package
- Do not ship static library

- flex 2.6.4:
  * Some minor performance enhancements
  * honor user defined yy_* macros again
- includes changes from 2.6.3:
  * several bug fixes resolved problems introduced in recent flex
    versions regarding processing of comments, literals and various
    quoting scenarios.
  * fix buffer overflow through long path (bsc#1026047)
- includes changes from 2.6.2:
  * a segfalt involving yyrestart(NULL) has been fixed
  * flex should now handle quoting when mixed with m4 processing
    correctly
  * flex handles `[[' and `]]' correctly
  * flex no longer generates non-ANSI code
  * more compilation warnings were squashed in generated scanners
  * prevented a buffer overflow that could occur when input buffers
  were the exact wrong size
- drop flex-2.6.1-fPIC.patch
- build the shared library and split libfl

- Fix de-registration of the info files.

- Small spec file cleanup