gcc: Update version from 5.4 to 7.2

gcc-7 changes: <https://gcc.gnu.org/gcc-7/changes.html>
gcc-6 changes: <https://gcc.gnu.org/gcc-6/changes.html>

gcc.be0

@@ -1,13 +1,8 @@
 #!/bin/env beesh
 
-# BEE_VERSION gcc-5.4.0-0
-
-# we had some problems with the 5.4 release against glibc 2.26
-# which are already fixed on the gcc-5 branch
-#
-# bee download -c gcc-5-branch https://gcc.gnu.org/git/gcc.git
-#
-SRCURL[0]="/src/mariux/download/gcc-5.4.0_release_p1052_5de58e00a7b.tar.bz2"
+# BEE_VERSION gcc-7.2.0-0
+
+SRCURL[0]="https://ftp.gnu.org/gnu/gcc/gcc-${PKGVERSION}/gcc-${PKGVERSION}.tar.xz"
 
 LIBEXECDIR=/usr/lib
 LIBDIR=/usr/lib