[#CONC-328] Build fails due to missing include-dir for cURL

/usr/bin/cc -DHAVE_LIBRESSL -DHAVE_OPENSSL -DHAVE_REMOTEIO=1 -DHAVE_TLS -Ddialog_EXPORTS -Iinclude -Iplugins/auth -Iplugins/pvio -L/usr/local/libs -fstack-protector -fno-strict-aliasing -L/usr/local/libs -fstac

k-protector -fno-strict-aliasing -DDBUG_OFF -fPIC   -DPLUGIN_DYNAMIC=1 -MD -MT CMakeFiles/dialog.dir/plugins/auth/dialog.c.o -MF CMakeFiles/dialog.dir/plugins/auth/dialog.c.o.d -o CMakeFiles/dialog.dir/plugins/auth/dialog.c.o   -c plugins/auth/dialog.c

In file included from plugins/auth/dialog.c:25:                                                                                                                                                                                                                In file included from include/mysql/client_plugin.h:157:

include/mariadb/ma_io.h:23:10: fatal error: 'curl/curl.h' file not found                                                                                                                                                                                       #include <curl/curl.h>                                                                                                                                                                                                                                                  ^~~~~~~~~~~~~

1 error generated.

due to missing `-I/usr/local/include`. On FreeBSD cURL is not in the base OS but is a port that installs in /usr/local/

Adding `-I/usr/local/include` to CFLAGS prior to running cmake fixes this for me.

[CONC-328] Build fails due to missing include-dir for cURL Created: 2018-05-03 Updated: 2018-05-03
Status:	Open
Project:	MariaDB Connector/C
Component/s:	None
Affects Version/s:	3.0.4
Fix Version/s:	None

[CONC-328] Build fails due to missing include-dir for cURL Created: 2018-05-03 Updated: 2018-05-03