invalid conversion error in Android 1.6

Android 1.6 source code will build fail in emulator with gcc 4.4.1

It was caused by invalid conversion from const_char* to char*

To solve this issue, we have to cast const_char* to char*.

The break will issued in emulator/qtools/dmtrace.cpp and emulator/qtools/trace_reader.cpp

We have to fix those invalid conversion to make the build pass.

in emulator/qtools/dmtrace.cpp
line 166: char *paren = strchr(name, '('); => char *paren = (char *) strchr(name, '(');
line 183: char *dot = strrchr(name, '.'); => char *dot = (char *) strrchr(name, '.');

in emulator/qtools/trace_reader.cpp
line 1012: char *end = rindex(mmap_path, '@'); => const char *end = rindex(mmap_path, '@');
line 1015: char *start = rindex(mmap_path, '/'); => const char *start = rindex(mmap_path, '/');