Also cleaned up the general mkdir functionality.
Tested: on OS X.
Tested that a command line like: ./flatc -j -o foo/bar/baz tests/monster_test.fbs
generates files in foo/bar/baz/MyGame/Example/*.java which previously didn't exist.
Windows code was previously tested but has been moved, so needs to be tested again.
Change-Id: Iee943121b3be4f92961a3ec94c2cb578165f114a
Given the command
flatc -o . -c test.fbs
it would generate header file
.test_generated.h
rather than
./test_generated.h
This fixes this issue.
Tested:
Manually verified that flatc generates the correct output files given output
paths ending with and without '/' on Linux and Windows.
Bug: 16464827
Change-Id: I854cb881286f22690f1885f942cf3fd2fc59ca8d
