wx: Detect OpenGL for cross compilation

[joaohf]

Hello,

This PR intend to fix cross compilation issues for wx. And uses the same strategy following https://github.com/erlang/otp/pull/5728.

Without this patch I got:

builder@f985825fa055:/build/tmp/work/cortexa57-poky-linux/erlang/25.0-rc1-r0/git$ find -name config.log
./erts/config.log
./lib/crypto/config.log
./lib/common_test/config.log
./lib/wx/config.log
./lib/snmp/config.log
./lib/megaco/config.log
./lib/erl_interface/config.log
./make/config.log
builder@f985825fa055:/build/tmp/work/cortexa57-poky-linux/erlang/25.0-rc1-r0/git$ grep  'unsafe for cross-compilation' ./lib/wx/config.log
cc1: warning: include location "/usr/local/include" is unsafe for cross-compilation [-Wpoison-system-directories]

The general OpenGL detection is right, the issue is when the configure tries to find it in the alternative folders like /usr/X11R6 and usr/local/.

[github-actions[bot]]

CT Test Results

  1 files  11 suites   1m 43s :stopwatch: 80 tests 76 :heavy_check_mark: 4 :zzz: 0 :x: 84 runs  80 :heavy_check_mark: 4 :zzz: 0 :x:

Results for commit 547d87a3.

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[IngelaAndin]

Same as #5770