mac/linux: Use python3 for .sh scripts

Newer OS versions no longer ship with Python 2 by default.

cef_create_projects.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-python tools/gclient_hook.py
+python3 tools/gclient_hook.py

tools/fix_style.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-python tools/fix_style.py $@
+python3 tools/fix_style.py $@

tools/make_distrib.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-python make_distrib.py --output-dir ../binary_distrib/ $@
+python3 make_distrib.py --output-dir ../binary_distrib/ $@

tools/make_version_header.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-python tools/make_version_header.py include/cef_version.h
+python3 tools/make_version_header.py include/cef_version.h

tools/patch.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-python tools/patcher.py
+python3 tools/patcher.py

tools/patch_updater.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-python tools/patch_updater.py $@
+python3 tools/patch_updater.py $@

tools/translator.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-python translator.py --root-dir .. $@
+python3 translator.py --root-dir .. $@