fix: native linux build falsely detected as Termux

ober

04a15ce41768417b18555f33efd7b7bf0ed63779

diff --git a/support/build-jerboa-multicall.ss b/support/build-jerboa-multicall.ss
index 7dc5bf4..63182ea 100644
--- a/support/build-jerboa-multicall.ss
+++ b/support/build-jerboa-multicall.ss
@@ -395,7 +395,7 @@
   (let ([p (getenv "PREFIX")])
     (if (and p (> (string-length p) 0))
         p
-        "/data/data/com.termux/files/usr")))
+        "")))
 (define termux-android-native?
   (and (not cross?)
        (eq? target-os 'linux)