[lmi] PATCH: disable the of system libraries when building wx

[Vadim Zeitlin]

 Hello,

 I just lost quite some time on debugging a weird build problem which
turned out to be due to wx configure picking up the system libtiff version
when cross-compiling for MSW from Linux. Of course, it really shouldn't
have done this in the first place, and I hope to fix this in wx itself
later, but for now I'd like to propose the following simple patch (which I
could also push myself if you're fine with it):

---------------------------------- >8 --------------------------------------
commit 82c1165c562e3f08831809d9f70df984af8b958c
Author: Vadim Zeitlin <vadim AT tt-solutions DOT com>
Date:   2020-07-21 02:21:20 +0200

    Disable use of all system libraries when building wxWidgets

    We don't want to use any system libraries, not only Expat, linpng and
    zlib ones.

diff --git a/install_wx.sh b/install_wx.sh
index 5135e3a30..84b2dd838 100755
--- a/install_wx.sh
+++ b/install_wx.sh
@@ -115,6 +115,7 @@ config_options="
   --disable-ribbon
   --disable-richtext
   --disable-stc
+  --disable-sys-libs
   --disable-webview
   --enable-monolithic
   --enable-option-checking
@@ -122,9 +123,6 @@ config_options="
   --enable-stl
   --enable-vendor=$vendor
   --with-cxx=11
-  --with-expat=builtin
-  --with-libpng=builtin
-  --with-zlib=builtin
   --without-opengl
   --without-subdirs
   CPPFLAGS=-I$prefix/include
---------------------------------- >8 --------------------------------------

 This ensures that no system libraries will be picked up (even if other
ones are added in the future), which is exactly what we want here.

 Thanks in advance,
VZ

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