Do not require ec

Not available on Fedora 41 or 42.

Author: tobiasdiez

src/meson.build

@@ -150,7 +150,7 @@ zlib = dependency('zlib', version: '>=1.2.11')
 # https://github.com/conda-forge/eclib-feedstock/issues/48
 ec = dependency('eclib', version: '>=20231211', required: false, disabler: true)
 # Cannot be found via pkg-config
-ec = cc.find_library('ec', required: not is_windows, disabler: true)
+ec = cc.find_library('ec', required: false, disabler: true)
 ecm = cc.find_library('ecm', required: not is_windows, disabler: true)
 gmpxx = dependency('gmpxx', required: not is_windows, disabler: true)
 fflas = dependency(