Update packages

* MinGW-w64 8git
* GMP 6.2.1
* MPC 1.2.1
* ISL 0.23

README.md

@@ -2,13 +2,13 @@
 [MinGW-w64](https://mingw-w64.org) cross compiler build script for i686 (Win32) and x86_64 (Win64).
 
 ## Package
-* [MinGW-w64](https://mingw-w64.org) 7git
+* [MinGW-w64](https://mingw-w64.org) 8git
 * [Binutils](https://www.gnu.org/software/binutils/) 2.35git
 * [GCC](https://gcc.gnu.org/) 10git
-* [GMP](https://gmplib.org/) 6.2.0
+* [GMP](https://gmplib.org/) 6.2.1
 * [MPFR](http://www.mpfr.org/) 4.1.0
-* [MPC](http://www.multiprecision.org/mpc/) 1.1.0
-* [isl](http://isl.gforge.inria.fr/) 0.21
+* [MPC](http://www.multiprecision.org/mpc/) 1.2.1
+* [isl](http://isl.gforge.inria.fr/) 0.23
 
 ## Platforms
 mingw-w64-build should run on Ubuntu, Cygwin, macOS (with Homebrew), and other Bash based shells.

mingw-w64-build

@@ -17,13 +17,13 @@
 #
 
 v_script="4git"
-v_mingww64="7git"
+v_mingww64="8git"
 v_binutils="2.35git"
 v_gcc="10git"
-v_gmp="6.2.0"
+v_gmp="6.2.1"
 v_mpfr="4.1.0"
-v_mpc="1.1.0"
-v_isl="0.21"
+v_mpc="1.2.1"
+v_isl="0.23"
 
 show_help()
 {
@@ -84,7 +84,7 @@ download_sources()
   cd "$src" || error_exit
 
   echo "downloading mingw-w64" >&3
-  git clone --depth 1 -b v7.x https://git.code.sf.net/p/mingw-w64/mingw-w64 mingw-w64-$v_mingww64 || error_exit
+  git clone --depth 1 -b v8.x https://git.code.sf.net/p/mingw-w64/mingw-w64 mingw-w64-$v_mingww64 || error_exit
 
   echo "downloading binutils" >&3
   git clone --depth 1 -b binutils-2_35-branch git://sourceware.org/git/binutils-gdb.git binutils-$v_binutils || error_exit