Remove execution bit from source files

For some reason, those C source files had the executable bit set on the
file system.

diff --git a/CMakeLists.txt b/CMakeLists.txt
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/include/conf.h b/include/conf.h
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/include/defs.h b/include/defs.h
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/include/extern.h b/include/extern.h
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/include/info.h b/include/info.h
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/realtime.c b/realtime.c
old mode 100755 (executable)
new mode 100644 (file)