#12103 - CI for FreeBSD (#12179)

* Ref #12103 - adds FreeBSD CI
* Fix getApplFreebsd - length of the string includes the null terminator byte, so minus 1 for result length
* Show last commit in setup task.
* Remove .git from repository URL
* Don't include noisy details showing last commit.
* Add FreeBSD build status badge
* Fix #12182 - disable tconsole on FreeBSD
* Disable tgetaddrinfo on FreebSD as getaddrinfo doesn't support the ICMP protocol.
* Install boehm-gc-threaded
* Use libgc-threaded.so on FreeBSD rather than libgc.so.
* Simplify build failure handling. Update alt text for CI badge.
* Disable test on FreeBSD
* Simplify build config

- use GNU make to build csources
- set PATH variable using the environment key
- remove modification of config to set CC as this is already set

* Install git which seems to be missing from current freebsd images
* Revert change to how path is set
* Add a comment explaining why the length is truncated
* Fix tconsole.

.builds/freebsd.yml

@@ -0,0 +1,31 @@
+image: freebsd/latest
+packages:
+- databases/sqlite3
+- devel/boehm-gc-threaded
+- devel/pcre
+- devel/sdl20
+- devel/sfml
+- www/node
+- devel/gmake
+- devel/git
+sources:
+- https://github.com/nim-lang/Nim
+environment:
+  CC: /usr/bin/clang
+tasks:
+- setup: |
+    cd Nim
+    git clone --depth 1 -q https://github.com/nim-lang/csources.git
+    gmake -C csources -j $(sysctl -n hw.ncpu)
+    bin/nim c --skipUserCfg --skipParentCfg koch
+    echo 'export PATH=$HOME/Nim/bin:$PATH' >> $HOME/.buildenv
+- test: |
+    cd Nim
+    if ! ./koch runCI; then
+       nim c -r tools/ci_testresults.nim
+       exit 1
+     fi
+triggers:
+- action: email
+  condition: failure
+  to: Andreas Rumpf <rumpf_a@web.de>