build-script: find sqlite header

User-installed package headers are installed to `/usr/local/include` on
FreeBSD. The build system should tell the compiler where the additional
headers are located.

Utilities/build-script-helper.py

@@ -137,6 +137,11 @@ def get_swiftpm_options(swift_exec: str, args: argparse.Namespace, suppress_verb
         swiftpm_args += [
             '-Xlinker', '-rpath', '-Xlinker', '$ORIGIN/../lib/swift/android',
         ]
+    elif '-freebsd' in build_target:
+        # pkg installs packages to /usr/local/include on FreeBSD
+        # Required for SwiftPM to find sqlite
+        swiftpm_args += ['-Xcxx', '-I', '-Xcxx', '/usr/local/include',
+                         '-Xswiftc', '-I', '-Xswiftc', '/usr/local/include']
     elif not build_os.startswith('macosx'):
         # Library rpath for swift, dispatch, Foundation, etc. when installing
         swiftpm_args += [