main/gcc: upgrade to 10.2.1_git20210328

main/gcc/0001-posix_memalign.patch

main/gcc/0002-gcc-poison-system-directories.patch

main/gcc/0003-Turn-on-Wl-z-relro-z-now-by-default.patch

...urn-on-D_FORTIFY_SOURCE-2-by-default-for-C-C-ObjC-O.patch

...n-linux-targets-pass-as-needed-by-default-to-the-li.patch

...0006-Enable-Wformat-and-Wformat-security-by-default.patch

main/gcc/0007-Enable-Wtrampolines-by-default.patch

...isable-ssp-on-nostdlib-nodefaultlibs-and-ffreestand.patch

...nsure-that-msgfmt-doesn-t-encounter-problems-during.patch

...c/0010-Don-t-declare-asprintf-if-defined-as-a-macro.patch

...011-libiberty-copy-PIC-objects-during-build-process.patch

main/gcc/0012-libitm-disable-FORTIFY.patch

main/gcc/0013-libgcc_s.patch

main/gcc/0014-nopie.patch

...ibffi-use-__linux__-instead-of-__gnu_linux__-for-mu.patch

main/gcc/0016-dlang-update-zlib-binding.patch

...cc/0017-dlang-fix-fcntl-on-mips-add-libucontext-dep.patch

main/gcc/0018-ada-fix-shared-linking.patch

main/gcc/0019-build-fix-CXXFLAGS_FOR_BUILD-passing.patch

main/gcc/0020-add-fortify-headers-paths.patch