update the runtime paths to work in windows

[andjo403]

the old paths contained a / at the beginning of the path e.g. "/C:/" but the expected path is "C:/" and due to this all test for the targets javascript, python and c# failed on windows.

[BurtHarris]

I concur: this seems to substantially correct the problem I referred to with large numbers of tests failing on windows.

[BurtHarris]

Tests run: 620, Failures: 0, Errors: 0, Skipped: 6

[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ antlr4-tool-testsuite ---
[WARNING] JAR will be empty - no content was marked for inclusion!
[INFO] Building jar: C:\code\antlr4\tool-testsuite\target\antlr4-tool-testsuite-4.5.4-SNAPSHOT.jar
[INFO]
[INFO] --- maven-install-plugin:2.4:install (default-install) @ antlr4-tool-testsuite ---
[INFO] Installing C:\code\antlr4\tool-testsuite\target\antlr4-tool-testsuite-4.5.4-SNAPSHOT.jar to C:\Users\Burt_\.m2\repository\org\antlr\antlr4-tool-testsuite\4.5.4-SNAPSHOT\antlr4-tool-testsuite-4.5.4-SNAPSHOT.jar
[INFO] Installing C:\code\antlr4\tool-testsuite\pom.xml to C:\Users\Burt_\.m2\repository\org\antlr\antlr4-tool-testsuite\4.5.4-SNAPSHOT\antlr4-tool-testsuite-4.5.4-SNAPSHOT.pom
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] ANTLR 4 ............................................ SUCCESS [  0.381 s]
[INFO] ANTLR 4 Runtime .................................... SUCCESS [  5.191 s]
[INFO] ANTLR 4 Tool ....................................... SUCCESS [  1.725 s]
[INFO] ANTLR 4 Maven plugin ............................... SUCCESS [  1.724 s]
[INFO] ANTLR 4 Runtime Test Generator ..................... SUCCESS [08:56 min]
[INFO] ANTLR 4 Tool Tests ................................. SUCCESS [ 16.164 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 09:21 min
[INFO] Finished at: 2016-08-19T14:39:10-07:00
[INFO] Final Memory: 34M/124M
[INFO] ------------------------------------------------------------------------

[BurtHarris]

@parrt, this corrects an error which blocks testing on Windows. It would be nice to get it merged into master.

[parrt]

looks good. thanks @andjo403 !