bin/run: fix LO_TRACE on Windows

exedir has to be in the c:/foo form, instead of /cygdrive/c/foo,
otherwise a native wrapper set by LO_TRACE won't understand it.

With this, it's possible to use DrMemory on executables invoked by
bin/run.

Change-Id: I5332342fdbf7d9e4859360dd7fbd3d74c149b2dc

bin/run

@@ -21,7 +21,7 @@ if uname | grep -i CYGWIN >/dev/null; then
         dir=$(realpath "${dir}/..")
     done
 
-    exedir="${dir}"/workdir/LinkTarget/Executable
+    exedir=$(cygpath -m "${dir}"/workdir/LinkTarget/Executable)
     export URE_BOOTSTRAP=file:///$(cygpath -m "${dir}")/instdir/program/fundamental.ini
     export PATH=${PATH:+$PATH:}"${dir}"/instdir/program