python,python3: get rid of HOST_CFLAGS

They rely on system paths and are a bit misleading/confusing.
As seen here:
https://github.com/openwrt/packages/issues/3339

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/Makefile

@@ -220,10 +220,6 @@ define PyPackage/python/filespec
 -|$(PYTHON_PKG_DIR)
 endef
 
-HOST_CFLAGS+= \
-	-I/usr/include/ncursesw \
-	-I/usr/include/ncurses
-
 HOST_CONFIGURE_ARGS+= \
 	--without-cxx-main \
 	--without-pymalloc \

lang/python3/Makefile

@@ -208,10 +208,6 @@ define Py3Package/python3/filespec
 -|$(PYTHON3_PKG_DIR)
 endef
 
-HOST_CFLAGS+= \
-	-I/usr/include/ncursesw \
-	-I/usr/include/ncurses
-
 HOST_CONFIGURE_ARGS+= \
 	--without-cxx-main \
 	--without-pymalloc \