[SymForce] Print out fmt and spdlog version when finding packages

Topic: chaoqu_symforce_fmt_spdlog_version
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GitOrigin-RevId: c3f2ff98840d42093d2f1209f99d7f6bf6b129f0

Author: chao-qu-skydio

symforce/opt/CMakeLists.txt

@@ -28,7 +28,7 @@ if (NOT fmt_FOUND)
 
   add_fmt()
 else()
-  message(STATUS "fmt found")
+  message(STATUS "fmt found: ${fmt_VERSION}")
 endif()
 
 # ------------------------------------------------------------------------------
@@ -51,7 +51,7 @@ if (NOT spdlog_FOUND)
 
   add_spdlog()
 else()
-  message(STATUS "spdlog found")
+  message(STATUS "spdlog found: ${spdlog_VERSION}")
 endif()
 
 # ------------------------------------------------------------------------------