lang/python*: Replace DISABLED_EXTENSIONS with Setup.local

Currently, lang/python38 and lang/python39 don't honor
DISABLED_EXTENSIONS because patch-issue20210 was removed when
lang/python38 was added to the ports tree. patch-issue20210 is still
present on lang/python36 and lang/python37.

Building with poudriere is not affected because builds are executed in a
clean environment.

Setup.local is the more canonical and recommended method for customizing
Python builds for shared extensions & third party libraries.

Support for a *disabled* marker in Setup files was introduced in Python
3.7, so backport this fix to it to keep consistency in the ports tree.

PR:		243358 [1]
PR:		243937 [2]
Reported by:	ngie [1]
Reported by:	jcfyecrayz@liamekaens.com [2]
Reported by:	tuxillo (IRC) DPorts
Reviewed by:	koobs (python, maintainer)
Approved by:	koobs, dbaio (python, maintainer)
Differential Revision: https://reviews.freebsd.org/D31086

(cherry picked from commit a94d4b1)

lang/python37/Makefile

@@ -31,7 +31,7 @@ PYTHON_SUFFIX=		${PYTHON_VER:S/.//g}
 
 DISABLED_EXTENSIONS=	_sqlite3 _tkinter _gdbm
 CONFIGURE_ARGS+=	--enable-shared --with-system-ffi --with-system-libmpdec --without-ensurepip
-CONFIGURE_ENV+=		OPT="" DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS}"	# Null out OPT to respect user CFLAGS and remove optimizations
+CONFIGURE_ENV+=		OPT="" # Null out OPT to respect user CFLAGS and remove optimizations
 
 INSTALL_TARGET=		altinstall						# Don't want cloberring of unprefixed files
 
@@ -112,6 +112,11 @@ post-patch:
 # which introduces hidden dependency and breaks build
 	@${REINPLACE_CMD} -e 's|uuid/uuid.h|ignore_&|' ${WRKSRC}/configure
 	@${REINPLACE_CMD} -e '/find_library_file/ s|uuid|ignore_&|' ${WRKSRC}/setup.py
+# Apply DISABLED_EXTENSIONS
+	@${ECHO} '*disabled*' > ${WRKSRC}/Modules/Setup.local
+.  for _module in ${DISABLED_EXTENSIONS}
+		@${ECHO} ${_module} >> ${WRKSRC}/Modules/Setup.local
+.  endfor
 
 post-install:
 .if ! ${PORT_OPTIONS:MDEBUG}

lang/python38/Makefile

@@ -33,7 +33,7 @@ PYTHON_SUFFIX=		${PYTHON_VER:S/.//g}
 DISABLED_EXTENSIONS=	_sqlite3 _tkinter _gdbm
 CONFIGURE_ARGS+=	--enable-shared --without-ensurepip \
 			--with-system-ffi
-CONFIGURE_ENV+=		OPT="" DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS}"	# Null out OPT to respect user CFLAGS and remove optimizations
+CONFIGURE_ENV+=		OPT="" # Null out OPT to respect user CFLAGS and remove optimizations
 
 INSTALL_TARGET=		altinstall						# Don't want cloberring of unprefixed files
 
@@ -115,6 +115,11 @@ post-patch:
 # which introduces hidden dependency and breaks build
 	@${REINPLACE_CMD} -e 's|uuid/uuid.h|ignore_&|' ${WRKSRC}/configure
 	@${REINPLACE_CMD} -e '/find_library_file/ s|uuid|ignore_&|' ${WRKSRC}/setup.py
+# Apply DISABLED_EXTENSIONS
+	@${ECHO} '*disabled*' > ${WRKSRC}/Modules/Setup.local
+.  for _module in ${DISABLED_EXTENSIONS}
+		@${ECHO} ${_module} >> ${WRKSRC}/Modules/Setup.local
+.  endfor
 
 post-install:
 .if ! ${PORT_OPTIONS:MDEBUG}

lang/python39/Makefile

@@ -34,7 +34,7 @@ PYTHON_SUFFIX=		${PYTHON_VER:S/.//g}
 DISABLED_EXTENSIONS=	_sqlite3 _tkinter _gdbm
 CONFIGURE_ARGS+=	--enable-shared --without-ensurepip \
 			--with-system-ffi
-CONFIGURE_ENV+=		OPT="" DISABLED_EXTENSIONS="${DISABLED_EXTENSIONS}"	# Null out OPT to respect user CFLAGS and remove optimizations
+CONFIGURE_ENV+=		OPT="" # Null out OPT to respect user CFLAGS and remove optimizations
 
 INSTALL_TARGET=		altinstall						# Don't want cloberring of unprefixed files
 
@@ -116,6 +116,11 @@ post-patch:
 # which introduces hidden dependency and breaks build
 	@${REINPLACE_CMD} -e 's|uuid/uuid.h|ignore_&|' ${WRKSRC}/configure
 	@${REINPLACE_CMD} -e '/find_library_file/ s|uuid|ignore_&|' ${WRKSRC}/setup.py
+# Apply DISABLED_EXTENSIONS
+	@${ECHO} '*disabled*' > ${WRKSRC}/Modules/Setup.local
+.  for _module in ${DISABLED_EXTENSIONS}
+		@${ECHO} ${_module} >> ${WRKSRC}/Modules/Setup.local
+.  endfor
 
 post-install:
 .if ! ${PORT_OPTIONS:MDEBUG}