Doesn't build on Haiku after November 2020

[iDevPro]

After November 2020 llvm doesn't build in haiku. Reason is:

korli also added _SC_TTY_NAME_MAX to the supported sysconf parameters, added tcgetsid, fixed the definition of in6_addr, improved strace output for termios ioctls, and relaxed some checks in handling of network ioctls to fix incompatibilities with old OpenJDK versions. He also fixed handling of O_APPEND, added aligned_alloc (as specified in C11), made fsync() return EINVAL on fifos, and moved ***asprintf and vasprintf*** to BSD extensions as they are not part of POSIX.

Also has some trouble with swift-cmark git pull over the script. I tried by hand, build started but not success on vasprintf in debug.h inside swift-llvm.

Full discussion here:
https://discuss.haiku-os.org/t/gsoc-2017-porting-swift-to-haiku-final-report-haiku-project/6095/21

[iDevPro]

diff --git a/build-script.sh b/build-script.sh
index 4e2afce..153b154 100755
--- a/build-script.sh
+++ b/build-script.sh
@@ -1,4 +1,4 @@
./swift/utils/build-script -R --extra-cmake-options='-DLLVM_ENABLE_ASSERTIONS=TRUE
-DCMAKE_SKIP_RPATH=FALSE -DLLVM_ENABLE_RTTI=ON -DLLVM_TARGETS_TO_BUILD=X86
--DLLVM_ENABLE_THREADS=ON -DCMAKE_C_FLAGS=-fPIC -DCMAKE_CXX_FLAGS=-fPIC'
+-DLLVM_ENABLE_THREADS=ON -DCMAKE_C_FLAGS="-D_DEFAULT_SOURCE -fPIC" -DCMAKE_CXX_FLAGS="-fPIC -D_DEFAULT_SOURCE" -DCMAKE_EXE_LINKER_FLAGS=-lbsd '
--stdlib-deployment-targets=haiku-x86_64 $@