Workaround for file name case inconsistency

Change-Id: Ia13dc01f86e51064658d5ad9a996c6bd555cbeef

solenv/gbuild/gbuild.mk

@@ -166,7 +166,19 @@ $(eval $(call gb_Helper_collect_knownlibs))
 gb_Library_DLLPOSTFIX := lo
 
 # Include platform/cpu/compiler specific config/definitions
-include $(GBUILDDIR)/platform/$(OS)_$(CPUNAME)_$(COM).mk
+
+# Work around inconsistency in case of $(OS) being "IOS" (all
+# upper-case) vs. the file being included here having the name
+# iOS_*_*.mk (lower-case 'i'). This went unnoticed until now when I
+# happen to build for iOS on a case-sensitive file system.
+
+ifeq ($(OS),IOS)
+gbuildplatformosname=iOS
+else
+gbuildplatformosname=$(OS)
+endif
+
+include $(GBUILDDIR)/platform/$(gbuildplatformosname)_$(CPUNAME)_$(COM).mk
 
 # this is optional
 include $(SRCDIR)/RepositoryFixes.mk