Updating Gnuastro to its most recent version 0.12

With this commit, Gnuastro has been updated to its most recent version
(v0.12) released.

reproduce/software/config/checksums.conf

@@ -92,7 +92,7 @@ flex-checksum = e9785f3d620a204b7d20222888917dc065c2036cae28667065bf7862dfa1b252
 freetype-checksum = 02f0f4211f9cee5b5e46ebe61190482fca5b41bc26be06fcf0d2d717e9fb119229308398c420eeea476fa2511ca2d52948f1a3242efad30ca82ed0b07cd50e3a
 gdb-checksum = b4161df5adfce3eb51b3b3fc6072b2ef9f612f5e0f95b25bc57382812854836e9d1b24807c68cc8987e37e90112c6d75ffc1de3ea67a9f92858b4ce1af85c479
 ghostscript-checksum = acee64fae78771bffa19b0b2bfaba3c345b420f93ceb4fc9df5fb705f785c8ed720fde2aef53546fac6aca2f7366c64c68a6e373a71999a42dc71aadc9aa782f
-gnuastro-checksum = 718b391cc59e8f6b57afc963fb27161ecc9f32b18dcef1cf9c24c88f61d264d8d1154e59a74c36f6ac3a970e1a6f77eee288ec881899beb57e51cc55b56c089b
+gnuastro-checksum = e236814001c1740355cfb1490926c667d14c026c8e93249afb25c1fc934a8ef8c52178276b7ab5cdbeb819117f962a4c7f65df74f0fc35bf512388cbe3b26d39
 gsl-checksum = 0be8240715f0b86aba2c63d9f12da4dba4719d4e350e9308d279e0dd3b2f0519ea26fd2e38a17f3e8cf43aacbaa2455207a7ca0d6c305f3b8725e8ece2250a74
 hdf5-checksum = f828ee9d63533effe1ad358230e5ce7b64c5016e49291d9533575f713cbfba496290fc0151fd9617898bdf36785984ddb38a9207f529d7702d4e23838fe050d8
 healpix-checksum = 29fe680d757bd94651bf029654257cb67286643aad510df4c2f0b06245174411376ec1beca64feebfac14a6fc0194525170635842916d79dcaddeddd9ac6f6c7

reproduce/software/config/versions.conf

@@ -88,7 +88,7 @@ flock-version = 0.2.3
 freetype-version = 2.9
 gdb-version = 8.3
 ghostscript-version = 9.50
-gnuastro-version = 0.11
+gnuastro-version = 0.12
 gsl-version = 2.6
 hdf5-version = 1.10.5
 healpix-version = 3.50