build: always use python3

Makefile

@@ -16,13 +16,13 @@ systemlibs: systemlibtarget pack
 windows: windowstarget
 
 default:
-	python -m nuitka --follow-imports --enable-plugin=qt-plugins --include-qt-plugins=all --python-flag=-O -o plchat plchat.py
+	python3 -m nuitka --follow-imports --enable-plugin=qt-plugins --include-qt-plugins=all --python-flag=-O -o plchat plchat.py
 
 windowstarget:
-	python -m nuitka --follow-imports --include-module=win32ctypes --enable-plugin=qt-plugins --include-qt-plugins=all --windows-disable-console --windows-icon-from-ico=fedi.ico --windows-company-name=plchat --windows-product-name=plchat --windows-product-version=$(PRODUCTVER) --python-flag=-O -o plchat plchat.py
+	python3 -m nuitka --follow-imports --include-module=win32ctypes --enable-plugin=qt-plugins --include-qt-plugins=all --windows-disable-console --windows-icon-from-ico=fedi.ico --windows-company-name=plchat --windows-product-name=plchat --windows-product-version=$(PRODUCTVER) --python-flag=-O -o plchat plchat.py
 
 systemlibtarget:
-	python -m nuitka --nofollow-imports --follow-import=misc --follow-import=monkeypatch --follow-import=pleroma --follow-import=timeconvert --follow-import=videowidget --follow-import=audiowidget --python-flag=-O -o plchat plchat.py
+	python3 -m nuitka --nofollow-imports --follow-import=misc --follow-import=monkeypatch --follow-import=pleroma --follow-import=timeconvert --follow-import=videowidget --follow-import=audiowidget --python-flag=-O -o plchat plchat.py
 
 pack:
 	mkdir dist
@@ -45,4 +45,4 @@ install:
 	install dist/fedi.svg $(PREFIX)$(LIBDIR)
 	install dist/send.svg $(PREFIX)$(LIBDIR)
 	install dist/unread.svg $(PREFIX)$(LIBDIR)
-	ln -sf $(PREFIX)$(LIBDIR)plchat $(PREFIX)bin/plchat
+	ln -sf $(PREFIX)$(LIBDIR)plchat $(PREFIX)bin/plchat