refactor(camodocal): remove ceres depend

Makefile

@@ -93,18 +93,6 @@ submodules:
 
 .PHONY: submodules
 
-# 3rdparty
-
-ceres:
-	@$(call echo,Make $@)
-	@$(call cmake_build,./3rdparty/ceres-solver-1.11.0/_build,.., \
-		-DCMAKE_INSTALL_PREFIX=$(MKFILE_DIR)/3rdparty/ceres \
-		-DGFLAGS_PREFER_EXPORTED_GFLAGS_CMAKE_CONFIGURATION=OFF \
-		-DMINIGLOG=ON)
-	@cd ./3rdparty/ceres-solver-1.11.0/_build; make install
-
-.PHONY: ceres
-
 # init
 
 init:
@@ -117,9 +105,6 @@ init:
 
 build:
 	@$(call echo,Make $@)
-ifneq ($(CAM_MODELS),)
-	@$(MAKE) ceres
-endif
 ifeq ($(HOST_OS),Win)
 	@$(call cmake_build,./_build,..,-DCMAKE_INSTALL_PREFIX=$(MKFILE_DIR)/_install)
 else
@@ -301,7 +286,6 @@ cleanlog:
 	@$(call rm_f,*FATAL*)
 
 cleanall: clean cleandoc
-	@$(call rm,./3rdparty/ceres-solver-1.11.0/_build/)
 	@$(call rm,./test/gtest/_build/)
 	@$(FIND) . -type f -name ".DS_Store" -print0 | xargs -0 rm -f
 	@$(call rm,./$(PBCVT_DIR)/)