url relocation build markdown

[spaette]

cf: #56147

.html and .pdf rendering may be resolved for this content

removed bold font

some links updated

for which used the savannah link

but did not change to this redirect

https://www.intel.com/content/www/us/en/developer/tools/oneapi/onemkl.html

neither LLVM version nor patches link were changed

some minor phrasing changes but those are consistent with the build tools' and dependencies' posted descriptions

[spaette]

@c42f

not for this pull

Any other deps to be slated for inclusion in the build.md file?

$ pushd /tmp/julia/deps && ls *.mk
/tmp/julia/deps ~
BOLT.mk
JuliaSyntax.mk
blastrampoline.mk
csl.mk
curl.mk
dsfmt.mk
gmp.mk
ittapi.mk
libgit2.mk
libssh2.mk
libsuitesparse.mk
libtracyclient.mk
libuv.mk
libwhich.mk
llvm-options.mk
llvm.mk
mbedtls.mk
mpfr.mk
nghttp2.mk
nvtx.mk
objconv.mk
openblas.mk
openlibm.mk
p7zip.mk
patchelf.mk
pcre.mk
sanitizers.mk
terminfo.mk
unwind.mk
utf8proc.mk
zlib.mk
$ popd
~
$