Remove unneeded build flags.

Just because I use them for SyncTERM releases doesn't mean we want
them for CI.

.gitlab-ci.yml

@@ -31,7 +31,7 @@ include:
       platform: 'x86'
       tagname: 'FreeBSD'
       cross_platform: 'yes'
-      build_flags: 'AR=mingw32-ar AS=mingw32-as CC=mingw32-gcc CXX=mingw32-g++ RANLIB=mingw32-ranlib RELEASE=1 STATIC_CRYPTLIB=yes USE_SDL=1 VERBOSE=please WINDRES=mingw32-windres'
+      build_flags: 'AR=mingw32-ar AS=mingw32-as CC=mingw32-gcc CXX=mingw32-g++ RANLIB=mingw32-ranlib WINDRES=mingw32-windres RELEASE=1'
       no_javascript: 'yes'
       has_curses: 'no'
   - local: '.gitlab-ci-unix.yml'