cmake: throw an error if ARM isn't detected

cmake/LibraryNaming.cmake

@@ -67,6 +67,8 @@ elseif(XASH_ARM)
 		set(BUILDARCH "${BUILDARCH}5")
 	elseif(XASH_ARMv4)
 		set(BUILDARCH "${BUILDARCH}4")
+	else()
+		message(SEND_ERROR "Unknown ARM")
 	endif()
 
 	if(XASH_ARM_HARDFP)
@@ -86,7 +88,9 @@ else()
 	message(SEND_ERROR "Place your architecture name here! If this is a mistake, try to fix conditions above and report a bug")
 endif()
 
-if(BUILDOS AND BUILDARCH)
+if(BUILDOS STREQUAL "android")
+	set(POSTFIX "") # force disable for Android, as Android ports aren't distributed in normal way and doesn't follow library naming
+elif(BUILDOS AND BUILDARCH)
 	set(POSTFIX "_${BUILDOS}_${BUILDARCH}")
 elseif(BUILDARCH)
 	set(POSTFIX "_${BUILDARCH}")