Use pipe to speed up compilation.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1738 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/Makefile

@@ -49,7 +49,7 @@ LINKOBJ := $(IRRMESHOBJ) $(IRROBJ) $(IRRPARTICLEOBJ) $(IRRANIMOBJ) \
 #Compiler flags
 CXXINCS = -I../../include -Izlib -Ijpeglib -Ilibpng
 CPPFLAGS = $(CXXINCS) -DIRRLICHT_EXPORTS=1
-CXXFLAGS = -Wall
+CXXFLAGS = -Wall -pipe
 ifndef NDEBUG
 CXXFLAGS += -g -D_DEBUG
 else