url: a short host name + port is not a scheme

The function identifying a leading "scheme" part of the URL considered a
few letters ending with a colon to be a scheme, making something like
"short:80" to become an unknown scheme instead of a short host name and
a port number.

Extended test 1560 to verify.

Also fixed test203 to use file_pwd to make it get the correct path on
windows. Removed test 2070 since it was a duplicate of 203.

Assisted-by: Marcel Raad
Reported-by: Hagai Auro
Fixes #3220
Fixes #3233
Closes #3223
Closes #3235

tests/data/Makefile.inc

@@ -201,7 +201,7 @@ test2040 test2041 test2042 test2043 test2044 test2045 test2046 test2047 \
 test2048 test2049 test2050 test2051 test2052 test2053 test2054 test2055 \
 test2056 test2057 test2058 test2059 test2060 test2061 test2062 test2063 \
 test2064 test2065 test2066 test2067 test2068 test2069 \
-test2070 test2071 test2072 test2073 test2074 test2075 \
+         test2071 test2072 test2073 test2074 test2075 \
 test2080 \
 test2100 \
 \

tests/data/test203

@@ -24,8 +24,12 @@ file
  <name>
 file:/path URL with a single slash
  </name>
+<setenv>
+# Needed for MSYS2 to not convert
+MSYS2_ARG_CONV_EXCL=file:
+</setenv>
 <command option="no-include">
-file:%PWD/log/test203.txt
+file:%FILE_PWD/log/test203.txt
 </command>
 <file name="log/test203.txt">
 foo

tests/data/test2070

@@ -1,41 +0,0 @@
-<testcase>
-<info>
-<keywords>
-FILE
-</keywords>
-</info>
-
-<reply>
-<data>
-foo
-   bar
-bar
-   foo
-moo
-</data>
-</reply>
-
-# Client-side
-<client>
-<server>
-file
-</server>
- <name>
-basic file:// file with no authority
- </name>
-<command option="no-include">
-file:%PWD/log/test2070.txt
-</command>
-<file name="log/test2070.txt">
-foo
-   bar
-bar
-   foo
-moo
-</file>
-</client>
-
-# Verify data after the test has been "shot"
-<verify>
-</verify>
-</testcase>