coin: Allow using configure instead of cmake for top-level builds

This is the qt5 counterpart to the qtbase instructions to allow
using configure instead of cmake when configuring a top-level build.

Task-number: QTQAINFRA-4357
Task-number: QTQAINFRA-4815
Change-Id: Ie5af31f9349a6dd88fa7699d40dad659180814e2
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Toni Saario <toni.saario@qt.io>
(cherry picked from commit 2ee43055ed)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

coin/instructions/prepare_configure_executable.yaml

@@ -0,0 +1,37 @@
+# Call either cmake or configure depending on whether the
+# UseConfigure platform configuration feature is set.
+# We should remove the cmake branch, once all platform configurations
+# are ported to use configure.
+# TODO: Remove this file, and reference the one in qtbase, once all
+# all dependencies are propagated.
+type: Group
+instructions:
+  - type: Group
+    enable_if:
+      condition: property
+      property: features
+      contains_value: UseConfigure
+    instructions:
+      - type: EnvironmentVariable
+        variableName: CONFIGURE_EXECUTABLE
+        variableValue: "{{.SourceDir}}/configure"
+        disable_if:
+          condition: property
+          property: host.os
+          equals_value: Windows
+      - type: EnvironmentVariable
+        variableName: CONFIGURE_EXECUTABLE
+        variableValue: "{{.SourceDir}}\\configure.bat"
+        enable_if:
+          condition: property
+          property: host.os
+          equals_value: Windows
+  - type: Group
+    disable_if:
+      condition: property
+      property: features
+      contains_value: UseConfigure
+    instructions:
+      - type: EnvironmentVariable
+        variableName: CONFIGURE_EXECUTABLE
+        variableValue: "cmake"