[tint][build][cmake] Drop GN-style target names

This was required when we were globbing test and benchmark files to a pair of targets.
Now we use OBJECT libraries, we don't need this filth.

Change-Id: Ib3af9acf99ba619c67134eaeff611afb5dc68cd1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/147522
Commit-Queue: Ben Clayton <bclayton@google.com>
Auto-Submit: Ben Clayton <bclayton@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
diff --git a/src/tint/utils/math/BUILD.cmake b/src/tint/utils/math/BUILD.cmake
index feb8246..8f869c3 100644
--- a/src/tint/utils/math/BUILD.cmake
+++ b/src/tint/utils/math/BUILD.cmake
@@ -21,9 +21,10 @@
 ################################################################################
 
 ################################################################################
-# CMake target: 'tint_utils_math'
+# Target:    tint_utils_math
+# Kind:      lib
 ################################################################################
-tint_add_target("utils/math"
+tint_add_target(tint_utils_math lib
   utils/math/crc32.h
   utils/math/hash.h
   utils/math/math.cc
@@ -31,24 +32,25 @@
 )
 
 ################################################################################
-# CMake target: 'tint_utils_math_test'
+# Target:    tint_utils_math_test
+# Kind:      test
 ################################################################################
-tint_add_target("utils/math:test"
+tint_add_target(tint_utils_math_test test
   utils/math/crc32_test.cc
   utils/math/hash_test.cc
   utils/math/math_test.cc
 )
 
-tint_target_add_dependencies("utils/math:test"
-  "utils/containers"
-  "utils/ice"
-  "utils/macros"
-  "utils/math"
-  "utils/memory"
-  "utils/rtti"
-  "utils/traits"
+tint_target_add_dependencies(tint_utils_math_test test
+  tint_utils_containers
+  tint_utils_ice
+  tint_utils_macros
+  tint_utils_math
+  tint_utils_memory
+  tint_utils_rtti
+  tint_utils_traits
 )
 
-tint_target_add_external_dependencies("utils/math:test"
+tint_target_add_external_dependencies(tint_utils_math_test test
   "gtest"
 )