Unify use of -mdynamic-no-pic

Apply -mdynamic-no-pic in a single place in the Makefile instead of 5 places.

Verified on three different Macs:
- a MacBook from 2013
- a MacBook running MacOS 10.9.5
- an iMac running MacOS 10.13.3

No functional change.

src/Makefile

@@ -279,37 +279,16 @@ ifeq ($(optimize),yes)
 	CXXFLAGS += -O3
 
 	ifeq ($(comp),gcc)
-
-		ifeq ($(KERNEL),Darwin)
-			ifeq ($(arch),i386)
-				CXXFLAGS += -mdynamic-no-pic
-			endif
-			ifeq ($(arch),x86_64)
-				CXXFLAGS += -mdynamic-no-pic
-			endif
-		endif
-
 		ifeq ($(OS), Android)
 			CXXFLAGS += -fno-gcse -mthumb -march=armv7-a -mfloat-abi=softfp
 		endif
 	endif
-
-	ifeq ($(comp),icc)
+	
+	ifeq ($(comp),$(filter $(comp),gcc clang icc))
 		ifeq ($(KERNEL),Darwin)
 			CXXFLAGS += -mdynamic-no-pic
 		endif
 	endif
-
-	ifeq ($(comp),clang)
-		ifeq ($(KERNEL),Darwin)
-			ifeq ($(arch),i386)
-				CXXFLAGS += -mdynamic-no-pic
-			endif
-			ifeq ($(arch),x86_64)
-				CXXFLAGS += -mdynamic-no-pic
-			endif
-		endif
-	endif
 endif
 
 ### 3.4 Bits