Remove gnuisms. The Find Hidden checkbox does nothing now.

Index: src/SearchWindow.cpp
--- src/SearchWindow.cpp.orig
+++ src/SearchWindow.cpp
@@ -650,7 +650,7 @@ long SearchWindow::onCmdStart(FXObject*, FXSelector, v
     }
     else
     {
-        searchcommand = "find -P " + ::quote(wheredir->getText());
+        searchcommand = "find " + ::quote(wheredir->getText());
     }
 
     // Ignore case
@@ -756,7 +756,7 @@ long SearchWindow::onCmdStart(FXObject*, FXSelector, v
     // Hidden files
     if (!findhidden->getCheck())
     {
-        searchcommand += " \\( ! -regex '.*/\\..*' \\)";
+        searchcommand += " ! -path .";
     }
 
     // Without grep command