[lmi] [PATCH] Allow installing wxWidgets from GitHub

[Vadim Zeitlin]

 Hello,

 The following patch allows to specify the SHA-1 of the commit in wxWidgets
repository to get from GitHub by doing, for example

        make -f install_wx.make \
            wx_commit_sha=64308117e830e50ba4ab062ece9ab3196f305914 \
            wx_md5=8290db222d7ccc08a026200288cc177d

This is needed because although the recipe for building wxWidgets from git
version outlined in Greg's 2014-10-25 email[*] works just fine when working
with an already installed lmi, it can't be used when testing the
installation from scratch using install_msw.sh script, while as with this
patch it's enough to edit the downloaded script to add wx_commit_sha and
wx_md5 definitions to make command line and then everything works. And
while I made these changes for this reason only, I think they might be used
for someone who needs to build the latest lmi without any complications
with git, wxWidgets and so on.

 As usual, please let me know if you have any questions about this patch,
VZ

[*] http://lists.nongnu.org/archive/html/lmi/2014-10/msg00083.html

Allow-using-arbitrary-wxWidgets-commits-in-install_wx.patch
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