curl: error out if -T and -d are used for the same URL

As one implies PUT and the other POST, both cannot be used
simultaneously.

Add test 378 to verify.

Reported-by: Boris Verkhovskiy
Fixes #8704
Closes #8715

tests/data/Makefile.inc

@@ -61,7 +61,7 @@ test334 test335 test336 test337 test338 test339 test340 test341 test342 \
 test343 test344 test345 test346 test347 test348 test349 test350 test351 \
 test352 test353 test354 test355 test356 test357 test358 test359 test360 \
 test361 test362 test363 test364 test365 test366 test367 test368 test369 \
-test370 test371 test372 test373 test374 test375 test376 \
+test370 test371 test372 test373 test374 test375 test376 test378 \
 \
 test380 test381 test383 test384 test385 test386 \
 \

tests/data/test378

@@ -0,0 +1,39 @@
+<testcase>
+<info>
+<keywords>
+HTTP PUT
+HTTP POST
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+none
+</server>
+ <name>
+Reject using -T and -d at once
+ </name>
+ <command>
+-T log/%TESTNUMBER -d input http://never-accessed
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<errorcode>
+2
+</errorcode>
+<stderr mode="text">
+Warning: You can only select one HTTP request method! You asked for both PUT 
+Warning: (-T, --upload-file) and POST (-d, --data).
+</stderr>
+</verify>
+</testcase>