Two source files are executable

A casual ls -l on src/or highlighted two source files (control.c and router.c) as being executable. With the command find -executable -type f | grep "\.[c|h]$" it turned out these were the only two files with this anomaly. The change was made in commit 51e13cd1.

The patch would be:

diff --git a/src/or/control.c b/src/or/control.c
old mode 100755
new mode 100644
diff --git a/src/or/router.c b/src/or/router.c
old mode 100755
new mode 100644