Replace ukbhit by kbd_enter_pressed, not requiring tcgetattr:

Note that it behaves differently now
* it looks for Enter key only, not any key
* it "eats" the input, no need for (void)getchar() after it
* it works the same no matter the value of ICANON
* the mingw version has been adapted to act the similarly

This should fix its usage on Android where tcgetattr always returns -1

client/scripts/didump.lua

@@ -488,7 +488,7 @@ local function readtag(mfkey, aeskey )
 
     for blockNo = 0, numBlocks-1 do
 
-        if core.ukbhit() then
+        if core.kbd_enter_pressed() then
             print("[fail] aborted by user")
             return nil
         end

client/scripts/formatMifare.lua

@@ -206,7 +206,7 @@ local function main(args)
             if x then core.console(cmd) end
         end
 
-        if core.ukbhit() then
+        if core.kbd_enter_pressed() then
             print('aborted by user')
             break
         end

client/scripts/lf_bulk.lua

@@ -186,7 +186,7 @@ local function main(args)
     for cardnum = baseid, endid do
         local card = cardHex(cardnum, facility)
         print('Press enter to program card '..cardnum..':'..facility..' (hex: '..card..')')
-        --This would be better with 'press any key', but we'll take what we can get.
+        --This would be better with 'press Enter', but we'll take what we can get.
         io.read()
         core.console( ('lf hid clone %s'):format(card) )
     end

client/scripts/mfkeys.lua

@@ -208,7 +208,7 @@ local function perform_check(numsectors)
 
     for sector = 0, #keys do
         -- Check if user aborted
-        if core.ukbhit() then
+        if core.kbd_enter_pressed() then
             print('Aborted by user')
             break
         end

client/scripts/mifare_autopwn.lua

@@ -70,7 +70,7 @@ end
 -- @return if successfull: an table containing card info
 -- @return if unsuccessfull : nil, error
 local function wait_for_mifare()
-    while not core.ukbhit() do
+    while not core.kbd_enter_pressed() do
         res, err = lib14a.read()
         if res then return res end
         -- err means that there was no response from card
@@ -161,7 +161,7 @@ local function main(args)
 
     while not _exit do
         if print_message then
-            print('Waiting for card or press any key to stop')
+            print('Waiting for card or press Enter to stop')
             print_message = false
         end
         res, err = wait_for_mifare()

client/scripts/tnp3dump.lua

@@ -198,7 +198,7 @@ local function main(args)
 
         io.flush()
 
-        if core.ukbhit() then
+        if core.kbd_enter_pressed() then
             print("aborted by user")
             break
         end

client/scripts/tracetest.lua

@@ -118,7 +118,7 @@ local function main(args)
 
         core.clearCommandBuffer()
 
-        if core.ukbhit() then
+        if core.kbd_enter_pressed() then
             print('aborted by user')
             break
         end