vs2015: teach 'make clean' to delete PDBs

Signed-off-by: Jeff Hostetler <[email protected]>

Author: jeffhostetler

Makefile

@@ -2570,6 +2570,9 @@ endif
 	$(RM) GIT-VERSION-FILE GIT-CFLAGS GIT-LDFLAGS GIT-BUILD-OPTIONS
 	$(RM) GIT-USER-AGENT GIT-PREFIX
 	$(RM) GIT-SCRIPT-DEFINES GIT-PERL-DEFINES GIT-PYTHON-VARS
+ifdef MSVC
+	$(RM) $(patsubst %.o,%.o.pdb,$(OBJECTS))
+endif
 
 .PHONY: all install profile-clean clean strip
 .PHONY: shell_compatibility_test please_set_SHELL_PATH_to_a_more_modern_shell