setupenv: Cygwin workaround: Check for CMake on Windows

setupenv.bashrc

@@ -94,11 +94,20 @@ else
     MISSING_DEPS=1
 fi
 
-if command -v cmake > /dev/null 2>&1; then
-    true
+if uname -s | tr [:upper:] [:lower:] | grep cygwin >/dev/null; then
+    if PATH=$(echo $PATH | sed 's/:/\n/g' | grep cygdrive | tr '\n' ':') command -v cmake > /dev/null 2>&1; then
+        true
+    else
+        echo "WARNING: \`cmake\` needs to be installed on Windows directly to build downloaded dependencies."
+        MISSING_DEPS=1
+    fi
 else
-    echo "WARNING: \`cmake\` is needed to build downloaded dependencies."
-    MISSING_DEPS=1
+    if command -v cmake > /dev/null 2>&1; then
+        true
+    else
+        echo "WARNING: \`cmake\` is needed to build downloaded dependencies."
+        MISSING_DEPS=1
+    fi
 fi
 
 if [ -z "$CXX" ]; then