[Stdcxx Wiki] Update of "gcc" by MartinSebor

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The following page has been changed by MartinSebor:
http://wiki.apache.org/stdcxx/gcc

The comment on the change is:
Moved from the Compilers page.

New page:
== GCC ==

=== Online References ===

 * [http://gcc.gnu.org/ GCC, the GNU Compiler Collection]
 * [http://gcc.gnu.org/onlinedocs/ GCC online documentation] home page.

=== Predefined Macros ===
||||||||<tablestyle="text-align:center;">GCC Predefined Macros||
||<rowstyle="background-color:powderblue;font-weight:bold">MACRO||GCC OPTION||VERSION||DESCRIPTION||
||`__GNUC__`|| ||all||<style="text-align:left">Defined to the major version of the compiler.||
||`__GNUC_MINOR__`|| ||all||<style="text-align:left">Defined to the minor version of the compiler.||
||`__GNUC_PATCHLEVEL__`|| ||all||<style="text-align:left">Defined to the micro (patch) version of the compiler.||
||`__GNUG__`|| ||all||<style="text-align:left">Defined to the same value as `__GUNC__` in C++ mode.||
||`__CYGWIN__`||[http://www.cygwin.com Cygwin]||all||<style="text-align:left">Defined whe compiling for the Cygwin environment.||
||`__MINGW32__`||[http://www.mingw.org MinGW]||all||<style="text-align:left">Defined whe compiling for the MinGW environment.||

=== Discussion Forums ===

[http://gcc.gnu.org/lists.html GCC Mailing Lists]

=== Bug Reports ===

 * [http://gcc.gnu.org/bugs.html How To Report Bugs]
 * [http://gcc.gnu.org/bugs.html#known Known Bugs]
 * [http://gcc.gnu.org/bugzilla/ GCC Bugzilla] for [http://www.fsf.org/ FSF] releases of GCC only.
 * [https://bugzilla.redhat.com/ Red Hat Bugzilla] for [http://www.redhat.com/ Red Hat] releases of GCC only.
 * [https://bugzilla.novell.com Novell Bugzilla] for [http://www.novell.com/ Novell] (formerly [http://www.suse.com/ SuSE]) releases of GCC only.