Reduce gsl::span usage so we can remove it

We already have absl::Span, no need to add more animals to the zoo.
This should let us delete 2 libraries out of third_party.

While we are here, the teensy code for 2019 wasn't being built.  Fix
that.

Change-Id: I247750016926122240bc76e6194cf2ddfc15e9c2
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/y2019/jevois/BUILD b/y2019/jevois/BUILD
index 915e37b..674924a 100644
--- a/y2019/jevois/BUILD
+++ b/y2019/jevois/BUILD
@@ -46,7 +46,6 @@
             "$(location jevois_crc.c)",
         ]),
     ]),
-    target_compatible_with = ["@platforms//os:linux"],
     tools = [
         "//third_party/pycrc:pycrc_main",
     ],
@@ -60,9 +59,8 @@
     hdrs = [
         "jevois_crc.h",
     ],
-    target_compatible_with = ["@platforms//os:linux"],
     deps = [
-        "//third_party/GSL",
+        "@com_google_absl//absl/types:span",
     ],
 )
 
@@ -92,7 +90,7 @@
         ":jevois_crc",
         ":structures",
         "//aos/util:bitpacking",
-        "//third_party/GSL",
+        "@com_google_absl//absl/types:span",
     ] + select({
         "@platforms//os:linux": ["//aos/logging"],
         "//conditions:default": [],
@@ -114,7 +112,7 @@
         ":structures",
         "//aos/containers:sized_array",
         "//aos/util:bitpacking",
-        "//third_party/GSL",
+        "@com_google_absl//absl/types:span",
     ] + select({
         "@platforms//os:linux": ["//aos/logging"],
         "//conditions:default": [],
@@ -151,7 +149,7 @@
         "cobs.h",
     ],
     deps = [
-        "//third_party/GSL",
+        "@com_google_absl//absl/types:span",
     ],
 )
 
@@ -165,7 +163,7 @@
         ":cobs",
         "//aos/testing:googletest",
         "//aos/testing:test_logging",
-        "//third_party/GSL",
+        "@com_google_absl//absl/types:span",
     ],
 )
 
@@ -197,8 +195,8 @@
         "//motors/peripheral:spi",
         "//motors/peripheral:uart",
         "//motors/print:usb",
-        "//third_party/GSL",
         "//y2019/vision:constants",
+        "@com_google_absl//absl/types:span",
     ],
 )