No need to setenv SAL_LOG in the code for iOS

One can set environment variables to be used when debugging an app in
Xcode, which is when it is interesting to see SAL_INFO output anyway.

(This is very different from Android, where one can't set environment
variables "before" an app starts, as apps there aren't separate
programs that would be exec'ed.)

Change-Id: I3971d1b2d1a849deac2722a90271ef2458db1643

ios/experimental/LibreOffice/LibreOffice/lo.mm

@@ -133,8 +133,6 @@ extern "C"
 void
 lo_initialize(void)
 {
-    setenv("SAL_LOG", "+WARN+INFO.vcl.headless+INFO.vcl.coretext+INFO.vcl.ios", 1);
-
     const char *argv[] = {
         "placeholder-exe",
         "-env:URE_INTERNAL_LIB_DIR=file:///",

sal/osl/all/log.cxx

@@ -97,10 +97,10 @@ char const * toString(sal_detail_LogLevel level) {
 
 #endif
 
-// getenv is not thread safe, so minimize use of result; except on Android and
-// iOS, see 60628799633ffde502cb105b98d3f254f93115aa "Notice if SAL_LOG is
+// getenv is not thread safe, so minimize use of result; except on Android,
+// see 60628799633ffde502cb105b98d3f254f93115aa "Notice if SAL_LOG is
 // changed while the process is running":
-#if defined ANDROID || defined IOS
+#if defined ANDROID
 
 char const * getEnvironmentVariable() {
     return std::getenv("SAL_LOG");