adb/base: minor compiler portability improvements

I've been using these changes to compile with Visual Studio.

- GetFileBasename(): __FILE__ uses \ with Visual Studio.

- adb_trace.cpp: Apparently VS needs an ampersand before the function name.

- "expr1 ? : expr2" is a GCC extension.

- <algorithm> contains std::min().

- seekdir can't always be #define'd because some headers have members
  named seekdir.

- adb_utils.cpp: Not really a compiler issue, just a random fix:
  0x7F/DEL is not printable.

Change-Id: I0dfb634f1ba4ccbc0d1b9f71b00e838fbebb3b41
Signed-off-by: Spencer Low <CompareAndSwap@gmail.com>
diff --git a/adb/adb_utils.cpp b/adb/adb_utils.cpp
index fd61bda..42f1c7d 100644
--- a/adb/adb_utils.cpp
+++ b/adb/adb_utils.cpp
@@ -182,11 +182,8 @@
     line.push_back(' ');
 
     for (size_t i = 0; i < byte_count; ++i) {
-        int c = p[i];
-        if (c < 32 || c > 127) {
-            c = '.';
-        }
-        line.push_back(c);
+        int ch = p[i];
+        line.push_back(isprint(ch) ? ch : '.');
     }
 
     return line;