[Bug 745804] flex fails to build on Windows

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745804

--- Comment #28 from Philippe Renon <philippe_renon at yahoo.fr> ---
Here is are the steps to get a windows build using MinGW/Msys.

First step was to install MinGW and the msys-base package.

Then I started the build process and addressed issues as they arose.

$ cerbero bootstrap

1/ [(2/15) gettext -> configure ]; Hangs when checking bison version
The bison version was the one coming with Git bash.
Note : any time an exe from git bash is found and used, the build hangs and a
full CPU is just churning.

Solution : install msys-bison package with:
$ mingw-get install msys-bison
This also installed m4.

2/ [(3/15) libiconv -> compile ] : Fails with ar command not found

Solution : install msys-binutils with:
$ mingw-get install msys-binutils

3/ [(4/15) autoconf -> configure ] Hangs when checking for perl
Again perl was found in Git bash.

Solution : install msys-perl with :
$ mingw-get install msys-perl

4/ [(9/15) libtool -> compile ] m4 crashes 
That one is weird. It does not cause the build to fail but the crash popups
need to be closed for the build to proceed.

Solution : rename or remove Git bash m4 (???)

cerbero bootstrap completes correctly...

$ cerbero package gstreamer-1.0

1/ [(8/87) gstreamer-1.0 -> configure ] Hangs when checking for flex
Again Git bash...

Solution  : install msys-flex package with:
$ mingw-get install msys-flex

cerbero package gstreamer-1.0 completes correctly

To resume:
- Install MinGW and msys-base
- Install msys-binutils msys-flex msys-bison msys-perl
- Remove Git bash m4.exe (???)

The need to remove m4.exe is really strange as cerbero should pick the one from
msys...

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