Install switch_curl.h to includes/

FS-6163 --resolve

Thanks-to: Davide Colombo <davec82@gmail.com>

Makefile.am

@@ -210,6 +210,7 @@ library_include_HEADERS = \
 	src/include/switch_xml.h \
 	src/include/switch_xml_config.h \
 	src/include/switch_cpp.h \
+	src/include/switch_curl.h \
 	src/include/switch_json.h \
 	libs/stfu/stfu.h \
 	libs/libteletone/src/libteletone_detect.h \