rename flips src dir

tools/Makefile

@@ -65,7 +65,7 @@ ifeq ($(HOST_ENV),MinGW)
 endif
 
 flips: CC := $(CXX)
-flips_SOURCES := Flips/Flips.cpp
+flips_SOURCES := FlipsSrc/Flips.cpp
 flips_CFLAGS := -Wall -Wextra -fopenmp -Os -flto -fuse-linker-plugin -fomit-frame-pointer -fmerge-all-constants \
 -fvisibility=hidden -fno-exceptions -fno-unwind-tables -fno-asynchronous-unwind-tables \
 -ffunction-sections -fdata-sections -Wl,--gc-sections \