chaning kivy depend from source to wheel

and also upgrading pip, as is required for using the kivy-released manylinux2010 binary/wheel. See also:

 * #2 (comment)

build/deps/download.sh

@@ -37,8 +37,12 @@ ${CURL} -s https://check.torproject.org | grep Congratulations | head -n1
 # and today's date
 date -u +"%Y-%m-%d"
 
+# first download and upgrade pip (required to get some wheels)
+${PYTHON} -m pip download --no-cache-dir pip==20.1.1
+${PYTHON} -m pip install --upgrade pip==20.1.1
+
 # pip (all platforms)
-${PYTHON} -m pip download kivy==1.11.1 libusb1==1.8 pyinstaller==3.6 altgraph==0.17 macholib==1.14 future==0.18.2 pefile==2019.4.18 pywin32-ctypes==0.2.0
+${PYTHON} -m pip download --no-cache-dir kivy==1.11.1 libusb1==1.8 pyinstaller==3.6 altgraph==0.17 macholib==1.14 future==0.18.2 pefile==2019.4.18 pywin32-ctypes==0.2.0
 
 # pip (platform-specific binaries/wheels)
 ${WGET} `${CURL} -s https://pypi.org/simple/kivy/ | grep -oE 'https://.*Kivy-1.11.1-cp37-cp37m-win_amd64.whl#'`

build/linux/buildAppImage.sh

@@ -86,7 +86,7 @@ firecfg --clean
 # PREPARE APPDIR #
 ##################
 
-# We use this ppython-appimage release as a base for building our own python
+# We use this python-appimage release as a base for building our own python
 # AppImage. We only have to add our code and depends to it.
 cp build/deps/python3.7.8-cp37-cp37m-manylinux2014_x86_64.AppImage /tmp/python.AppImage
 chmod +x /tmp/python.AppImage
@@ -98,7 +98,8 @@ mv /tmp/squashfs-root /tmp/kivy_appdir
 # install our pip depends from the files in the repo since pip doesn't provide
 # decent authentication and integrity checks on what it downloads from PyPI
 #  * https://security.stackexchange.com/a/234098/213165
-${FIREJAIL} /tmp/kivy_appdir/opt/python*/bin/python* -m pip install --ignore-installed --upgrade --cache-dir build/deps/ build/deps/Kivy-1.11.1.tar.gz
+${FIREJAIL} /tmp/kivy_appdir/opt/python*/bin/python* -m pip install --ignore-installed --upgrade --cache-dir build/deps/ build/deps/pip-20.1.1-py2.py3-none-any.whl
+${FIREJAIL} /tmp/kivy_appdir/opt/python*/bin/python* -m pip install --ignore-installed --upgrade --cache-dir build/deps/ build/deps/Kivy-1.11.1-cp37-cp37m-manylinux2010_x86_64.whl
 ${FIREJAIL} /tmp/kivy_appdir/opt/python*/bin/python* -m pip install --ignore-installed --upgrade --cache-dir build/deps/ build/deps/libusb-1.0.23.tar.bz2
 
 # add our code to the AppDir