pjsip: allow compiling with clang

Change-Id: Ia5a017b8216fca93f7401594670d8d8623d28715
Refs: #46066

daemon/libs/compile_pjsip.sh

@@ -9,6 +9,11 @@ then
     CONFIGURE=./configure-android
     # android doesn't need make
     MAKE="make dep"
+elif [ "$1" == "-c" ]
+then
+    export CC=clang
+    CONFIGURE=./configure
+    MAKE="make dep && make"
 else
     echo "Usage: $0 [or -a for android]"
     exit 1