gnu: icecat: Update to 38.7.1-gnu1.
* gnu/packages/gnuzilla.scm (icecat): Update to 38.7.1-gnu1.
[sources]: Remove numerous patches.
* gnu/packages/patches/icecat-CVE-2015-4477.patch,
gnu/packages/patches/icecat-CVE-2015-7207.patch,
gnu/packages/patches/icecat-CVE-2016-1952-pt01.patch,
gnu/packages/patches/icecat-CVE-2016-1952-pt02.patch,
gnu/packages/patches/icecat-CVE-2016-1952-pt03.patch,
gnu/packages/patches/icecat-CVE-2016-1952-pt04.patch,
gnu/packages/patches/icecat-CVE-2016-1952-pt05.patch,
gnu/packages/patches/icecat-CVE-2016-1952-pt06.patch,
gnu/packages/patches/icecat-CVE-2016-1954.patch,
gnu/packages/patches/icecat-CVE-2016-1960.patch,
gnu/packages/patches/icecat-CVE-2016-1961.patch,
gnu/packages/patches/icecat-CVE-2016-1962.patch,
gnu/packages/patches/icecat-CVE-2016-1964.patch,
gnu/packages/patches/icecat-CVE-2016-1965.patch,
gnu/packages/patches/icecat-CVE-2016-1966.patch,
gnu/packages/patches/icecat-CVE-2016-1974.patch,
gnu/packages/patches/icecat-icecatbug-1248851.patch,
gnu/packages/patches/icecat-update-graphite2.patch,
gnu/packages/patches/icecat-update-graphite2-pt2.patch: Remove files.
* gnu-system.am (dist_patch_DATA): Remove them.