switched to awk for macOS compability

Author: mattes-bru

other/tools/run_protoc.sh

@@ -24,11 +24,7 @@ command -v protoc-gen-mavsdk > /dev/null || {
 }
 
 function snake_case_to_camel_case {
-    if [[ "$OSTYPE" == "darwin"* ]]; then
-        echo $1 | gsed -r 's/(^|_)([a-z])/\U\2/g'
-    else
-        echo $1 | sed -r 's/(^|_)([a-z])/\U\2/g'
-    fi
+    echo $1 | awk -v FS="_" -v OFS="" '{for (i=1;i<=NF;i++) $i=toupper(substr($i,1,1)) substr($i,2)} 1'
 }
 
 function generate {