Remove executable permission from remaining source files

diff --git a/src/consts.rs b/src/consts.rs
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/src/lib.rs b/src/lib.rs
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/tests/consts.rs b/tests/consts.rs
old mode 100755 (executable)
new mode 100644 (file)

diff --git a/tests/mut_mut_macro.rs b/tests/mut_mut_macro.rs
old mode 100755 (executable)
new mode 100644 (file)