Modified C code to work with stricter Ubuntucompiler. Added make clean to see if I can get Docker to work.

mysql-client-tests/c/mysql-connector-c-test.c

@@ -1,10 +1,11 @@
 #include <stdio.h>
 #include <mysql.h>
 
+#define QUERIES_SIZE 5
+
 MYSQL mysql;
 MYSQL *conn;
 
-const int QUERIES_SIZE = 5;
 char *queries[QUERIES_SIZE] =
   {
    "create table test (pk int, value int, primary key(pk))",

mysql-client-tests/mysql-client-tests.bats

@@ -45,6 +45,6 @@ teardown() {
 }
 
 @test "c mysql connector" {
-    (cd $BATS_TEST_DIRNAME/c; make)
+    (cd $BATS_TEST_DIRNAME/c; make clean; make)
     $BATS_TEST_DIRNAME/c/mysql-connector-c-test $USER $PORT $REPO_NAME
 }