- LALSUITE_CHECK_BOINC() checks for BOINC libraries/headers, and sets C++
  compiler for any LAL library checks
- LALSUITE_END_CHECK_BOINC() restores C compiler, checks LAL was compiled
  with BOINC support, and hacks Automake to force C++ linking of programs
- Remove special BOINC flag variables, easier to use CFLAGS, LDFLAGS, etc
- Refs #5380
Original: c59129c8a3e685d4cf670ad16b78d30a5b498749