windows: Add check whether NSIS with large strings is being used

To avoid issues with cleared PATH it is required to use NSIS special build
with strings up to 8192 characters long. This patch adds build-time check to
installer script, that will protect from attempts to use normal NSIS build.

Signed-off-by: Anton Kolesov <[email protected]>

Author: anthony-kolesov

windows-installer/installer.nsi

@@ -35,6 +35,13 @@
   !error "arcver varaible must be defined."
 !endif
 
+# Check that NSIS build for large strings is used
+!if ${NSIS_MAX_STRLEN} < 8192
+    !error "NSIS_MAX_STRLEN is ${NSIS_MAX_STRLEN} which is less than 8192, \
+    Please see comments in installer.nsi for details on installing NSIS 'big \
+    string' version."
+!endif
+
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 ; Settings