gobject-introspection: get python version from python build.sh

Hardcoding it in gobject-introspection's build.sh and meson.patch will
most definetly lead to us failing to update it somewhere when updating
or rebuilding the package.

packages/gobject-introspection/build.sh

@@ -8,11 +8,13 @@ TERMUX_PKG_SRCURL=https://github.com/GNOME/gobject-introspection/archive/refs/ta
 TERMUX_PKG_SHA256=13595a257df7d0b71b002ec115f1faafd3295c9516f307e2c57bd219d5cd8369
 TERMUX_PKG_BUILD_DEPENDS="glib, python"
 
-_PYTHON_VERSION=3.10
-
-TERMUX_PKG_EXTRA_CONFIGURE_ARGS="-Dpython=python${_PYTHON_VERSION}"
-
 termux_step_pre_configure() {
+	_PYTHON_VERSION=$(. $TERMUX_SCRIPTDIR/packages/python/build.sh; echo $_MAJOR_VERSION)
+	TERMUX_PKG_EXTRA_CONFIGURE_ARGS="-Dpython=python${_PYTHON_VERSION}"
+	echo "Applying meson.diff"
+	sed "s%@PYTHON_VERSION@%$_PYTHON_VERSION%g" \
+		$TERMUX_PKG_BUILDER_DIR/meson.diff | patch --silent -p1
+
 	CPPFLAGS+=" -I$TERMUX_PREFIX/include/python${_PYTHON_VERSION} -I$TERMUX_PREFIX/include/python${_PYTHON_VERSION}/cpython"
 }
 

packages/gobject-introspection/meson.diff

@@ -24,7 +24,7 @@ diff -uNr gobject-introspection/giscanner/meson.build gobject-introspection.mod/
 -  dependencies: [glib_dep, gobject_dep, gio_dep, gmodule_dep,
 -                 python_ext_dep],
 +  dependencies: [glib_dep, gobject_dep, gio_dep, gmodule_dep],
-+  link_args: '-lpython3.10',
++  link_args: '-lpython@PYTHON_VERSION@',
    install: true,
    install_dir: giscannerdir,
  )
@@ -35,7 +35,7 @@ diff -uNr gobject-introspection/meson.build gobject-introspection.mod/meson.buil
    meson_version: '>= 0.50.1',
    default_options: [
      'warning_level=1',
-+    'c_link_args=-lpython3.10',
++    'c_link_args=-lpython@PYTHON_VERSION@',
      'buildtype=debugoptimized',
    ],
  )