vlib: fix os.exec().output usages, that may rely on trimmed lines

cmd/tools/fast/fast.v

@@ -70,7 +70,7 @@ fn main() {
 
 fn exec(s string) string {
 	e := os.exec(s) or { panic(err) }
-	return e.output
+	return e.output.trim_right('\r\n')
 }
 
 // returns milliseconds

cmd/tools/modules/scripting/scripting.v

@@ -58,7 +58,7 @@ pub fn run(cmd string) string {
 	}
 	verbose_trace_exec_result(x)
 	if x.exit_code == 0 {
-		return x.output
+		return x.output.trim_right('\r\n')
 	}
 	return ''
 }

vlib/v/builder/cc.v

@@ -403,7 +403,7 @@ fn (mut v Builder) cc() {
 		if v.pref.is_debug {
 			eword := 'error:'
 			khighlight := if term.can_show_color_on_stdout() { term.red(eword) } else { eword }
-			println(res.output.replace(eword, khighlight))
+			println(res.output.trim_right('\r\n').replace(eword, khighlight))
 			verror(c_error_info)
 		} else {
 			if res.output.len < 30 {

vlib/v/builder/msvc.v

@@ -138,8 +138,9 @@ fn find_vs(vswhere_dir, host_arch string) ?VsInstallation {
 	res := os.exec('"$vswhere_dir\\Microsoft Visual Studio\\Installer\\vswhere.exe" -latest -prerelease -products * -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath') or {
 		return error(err)
 	}
+	res_output := res.output.trim_right('\r\n')
 	// println('res: "$res"')
-	version := os.read_file('$res.output\\VC\\Auxiliary\\Build\\Microsoft.VCToolsVersion.default.txt') or {
+	version := os.read_file('$res_output\\VC\\Auxiliary\\Build\\Microsoft.VCToolsVersion.default.txt') or {
 		println('Unable to find msvc version')
 		return error('Unable to find vs installation')
 	}

vlib/v/gen/x64/tests/x64_test.v

@@ -48,8 +48,8 @@ fn test_x64() {
 		mut expected := os.read_file('$dir/${test}.out') or {
 			panic(err)
 		}
-		expected = expected.trim_space().trim('\n').replace('\r\n', '\n')
-		mut found := res.output.trim_space().trim('\n').replace('\r\n', '\n')
+		expected = expected.trim_right('\r\n').replace('\r\n', '\n')
+		mut found := res.output.trim_right('\r\n').replace('\r\n', '\n')
 		found = found.trim_space()
 		if expected != found {
 			println(term.red('FAIL'))

vlib/v/tests/inout/compiler_test.v

@@ -46,11 +46,11 @@ fn test_all() {
 		// println('============')
 		// println(res.output)
 		// println('============')
-		mut found := res.output.trim_space().trim('\n').replace('\r\n', '\n')
+		mut found := res.output.trim_right('\r\n').replace('\r\n', '\n')
 		mut expected := os.read_file(program.replace('.v', '') + '.out') or {
 			panic(err)
 		}
-		expected = expected.trim_space().trim('\n').replace('\r\n', '\n')
+		expected = expected.trim_right('\r\n').replace('\r\n', '\n')
 		if expected.contains('================ V panic ================') {
 			// panic include backtraces and absolute file paths, so can't do char by char comparison
 			n_found := normalize_panic_message( found, vroot )

vlib/v/util/errors.v

@@ -169,7 +169,7 @@ pub fn color_compare_files(diff_cmd, file1, file2 string) string {
 		x := os.exec(full_cmd) or {
 			return 'comparison command: `${full_cmd}` failed'
         }
-        return x.output
+        return x.output.trim_right('\r\n')
     }
     return ''
 }