build: get_platform function reused

utils.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+
+function get_platform {
+    local platform="unknown"
+    if [ "$(uname)" == "Darwin" ]; then
+        platform="darwin"
+    elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
+        platform="linux"
+    elif [ "$(expr substr $(uname -s) 1 10)" == "MINGW64_NT" ]; then
+        platform="mingw64"
+    elif [ "$(expr substr $(uname -s) 1 10)" == "MINGW32_NT" ]; then
+        platform="mingw32"
+    fi
+    echo "$platform"
+
+}
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