Revert "tests: use consistent environment variables for setting charset"

This reverts commit ecd1d020ab.

That commit caused test failures on my Debian Linux machine for all
changed test cases. We need to reconsider how that should get done.

tests/data/test1034

@@ -33,12 +33,7 @@ idn
 </features>
 <setenv>
 CHARSET=UTF-8
-LC_ALL=
-LC_CTYPE=UTF-8
 </setenv>
-<precheck>
-perl -MI18N::Langinfo=langinfo,CODESET -e 'die "Needs a UTF-8 locale" if (lc(langinfo(CODESET())) ne "utf-8");'
-</precheck>
  <name>
 HTTP over proxy with malformatted IDN host name
  </name>

tests/data/test1035

@@ -33,17 +33,13 @@ idn
 </features>
 <setenv>
 CHARSET=UTF-8
-LC_ALL=
-LC_CTYPE=UTF-8
+LANG=en_US.UTF-8
 </setenv>
-<precheck>
-perl -MI18N::Langinfo=langinfo,CODESET -e 'die "Needs a UTF-8 locale" if (lc(langinfo(CODESET())) ne "utf-8");'
-</precheck>
  <name>
 HTTP over proxy with too long IDN host name
  </name>
  <command>
-http://too-long-IDN-name-cürl-rüles-la-la-la-dee-da-flooby-nooby.local/page/1035 -x %HOSTIP:%HTTPPORT
+http://too-long-IDN-name-cürl-rüles-la-la-la-dee-da-flooby-nooby.local/page/1035 -x %HOSTIP:%HTTPPORT
 </command>
 </client>
 
@@ -54,8 +50,8 @@ http://too-long-IDN-name-cürl-rüles-la-la-la-dee-da-flooby-nooby.local/page/10
 ^User-Agent:.*
 </strip>
 <protocol>
-GET http://too-long-IDN-name-cürl-rüles-la-la-la-dee-da-flooby-nooby.local/page/1035 HTTP/1.1
-Host: too-long-IDN-name-cürl-rüles-la-la-la-dee-da-flooby-nooby.local
+GET http://too-long-IDN-name-cürl-rüles-la-la-la-dee-da-flooby-nooby.local/page/1035 HTTP/1.1
+Host: too-long-IDN-name-cürl-rüles-la-la-la-dee-da-flooby-nooby.local
 Accept: */*
 Proxy-Connection: Keep-Alive
 

tests/data/test165

@@ -32,12 +32,8 @@ idn
 </features>
 <setenv>
 CHARSET=UTF-8
-LC_ALL=
-LC_CTYPE=UTF-8
+LANG=en_US.UTF-8
 </setenv>
-<precheck>
-perl -MI18N::Langinfo=langinfo,CODESET -e 'die "Needs a UTF-8 locale" if (lc(langinfo(CODESET())) ne "utf-8");'
-</precheck>
  <name>
 HTTP over proxy with IDN host name
  </name>

tests/data/test2046

@@ -42,12 +42,8 @@ idn
 </features>
 <setenv>
 CHARSET=UTF-8
-LC_ALL=
-LC_CTYPE=UTF-8
+LANG=en_US.UTF-8
 </setenv>
-<precheck>
-perl -MI18N::Langinfo=langinfo,CODESET -e 'die "Needs a UTF-8 locale" if (lc(langinfo(CODESET())) ne "utf-8");'
-</precheck>
  <name>
 Connection re-use with IDN host name
  </name>

tests/data/test2047

@@ -43,12 +43,8 @@ idn
 </features>
 <setenv>
 CHARSET=UTF-8
-LC_ALL=
-LC_CTYPE=UTF-8
+LANG=en_US.UTF-8
 </setenv>
-<precheck>
-perl -MI18N::Langinfo=langinfo,CODESET -e 'die "Needs a UTF-8 locale" if (lc(langinfo(CODESET())) ne "utf-8");'
-</precheck>
  <name>
 Connection re-use with IDN host name over HTTP proxy
  </name>