MinGW-w64 Build Scripts

These build scripts are based on Zeranoe's MinGW-w64 build scripts (http://ffmpeg.zeranoe.com/blog/?cat=4)

Differences to Zeranoe's Script v3.6.7:
- New option to build for target OS
- Updated GCC and all other tools

Usage:
- Build a Cross-Compiler Toolchain with the script
- Add the resulting binaries into PATH
- Run the script again with the --target-build parameter

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Version History:
r37 - 2023-10-01
    GCC 13.2, mingw-w64 11.0.1
r36 - 2023-10-01
    GCC 12.3, binutils 2.41, mpfr 4.2.1, mpc 1.3.1, gmp 6.3.0
r35 - 2022-08-23
    GCC 12.2, binutils 2.39
r34 - 2022-04-25
    GCC 11.3, MingGW-w64 10.0.0
r33 - 2022-01-19
    Overriding the default _WIN32_WINNT for mingw-w64, and patching it for 64-bit time_t on 32-bit Windows
r32 - 2021-08-16
    Full support building GCC with POSIX thread model and winpthreads
r31 - 2021-08-15
    GCC 11.2, MingGW-w64 9.0.0
r30 - 2021-07-13
    GCC 10.3, MingGW-w64 8.0.2
r29 - 2021-02-27
    GCC 10.2, binutils 2.36.1, MingGW-w64 8.0.0
r28 - 2020-04-30
    GCC 9.3, binutils 2.34, MingGW-w64 7.0.0
r27 - 2019-10-10
    GCC 9.2, binutils 2.32, MingGW-w64 6.0.0
r26 - 2019-02-27
    GCC 8.3, mpfr 4.0.2
r25 - 2018-11-01
    GCC 8.2, binutils 2.31.1, MingGW-w64 5.0.4
r24 - 2018-02-07
    GCC 7.3, binutils 2.29.1, MingGW-w64 5.0.3
r23 - 2017-08-16
    GCC 7.2, binutils 2.29
r22 - 2017-06-02
    GCC 7.1, binutils 2.28, MingGW-w64 5.0.2
r21 - 2017-02-13
    MingGW-w64 5.0.1
r20 - 2016-12-29
    MingGW-w64 5.0.0
r19 - 2016-12-28
    GCC 6.3, gmp 6.1.2
r18 - 2016-09-27
    GCC 6.2, binutils 2.27, mpfr 3.1.5, gmp 6.1.1
r17 - 2016-06-14
    GCC 6.1
r16 - 2016-06-14
    GCC 5.4, MinGW-w64 4.0.6, mpfr 3.1.4, isl 0.16.1
r15 - 2015-12-04
    Updated to Zeranoe's Script v3.6.7
    GCC 5.3, gmp 6.1.0, isl 0.15
r14 - 2015-12-01
    binutils 2.25.1, MinGW-w64 4.0.4 (+ patches)
r13 - 2015-07-20
    GCC 5.2
r12 - 2015-07-01
    GCC 5.1
r11 - 2015-06-30
    Updated to Zeranoe's Script v3.6.6
    GCC 4.9.3, MinGW-w64 4.0.2
    mpfr 3.1.3
r10 - 2014-11-10
    GCC 4.9.2, MinGW-w64 3.3.0
r9 - 2014-07-30
    Updated to Zeranoe's Script v3.6.0
    GCC 4.9.1
r8 - 2014-05-22
    Updated to Zeranoe's Script v3.5.8
    GCC 4.8.3
r7 - 2013-10-20
    Updated to Zeranoe's Script v3.5.0
    GCC 4.8.2
r6 - 2013-06-01
    GCC 4.8.1, GMP 5.12
r5 - 2013-04-13
    Updated to Zeranoe's Script v3.2.3
r4 - 2013-03-24
    Updated to Zeranoe's Script v3.1.0
    Restored winpthreads, threading library can now be choosen on the commandline
    Support for GCC 4.8.0
    Updated to mpfr 3.1.2, binutils 2.23.1
    Updated to gmp 5.1.1, isl 0.11.1 and cloog 0.18.0 when building GCC 4.8.0
r3 - 2012-11-04
    Removed winpthreads build
    Updated mpc to 1.0
r2 - 2012-10-27
    Re-created script based on Zeranoe's Script v3.0.6
    Replaced second script with parameter to the first
r1 - 2012-06-23
    Initial Version