Revert "fix meson build of sirocco interface"

This reverts commit 7a1ccd5.

Author: dimpase

src/sage/libs/meson.build

@@ -1,3 +1,4 @@
+sirocco = cc.find_library('sirocco', required: false, disabler: true)
 # cannot be found via pkg-config
 ecl = cc.find_library('ecl', required: false, disabler: true)
 if not ecl.found() and not is_windows
@@ -64,12 +65,6 @@ else
   conf_data.set('SAGE_MAXIMA', maxima_bin.full_path())
 endif
 
-sirocco = dependency(
-  'libsirocco',
-  version: '>=2.1.0',
-  required: false,
-  disabler: true,
-)
 braiding = dependency(
   'libbraiding',
   version: '>=1.3.1',