Disable implicit function declaration warnings

This should address the issues found in:
https://lab.llvm.org/buildbot/#/builders/214/builds/839
diff --git a/MultiSource/Applications/d/CMakeLists.txt b/MultiSource/Applications/d/CMakeLists.txt
index 0198e23..9ef0c0a 100644
--- a/MultiSource/Applications/d/CMakeLists.txt
+++ b/MultiSource/Applications/d/CMakeLists.txt
@@ -1,4 +1,5 @@
 list(APPEND CPPFLAGS -DD_BUILD_VERSION=5725)
+list(APPEND CFLAGS -Wno-implicit-function-declaration)
 set(RUN_OPTIONS -v grammar.g)
 set(HASH_PROGRAM_OUTPUT 1)
 llvm_multisource(make_dparser
diff --git a/MultiSource/Applications/d/Makefile b/MultiSource/Applications/d/Makefile
index eeb38ca..6231e1a 100644
--- a/MultiSource/Applications/d/Makefile
+++ b/MultiSource/Applications/d/Makefile
@@ -2,6 +2,7 @@
 PROG = make_dparser
 Source=make_dparser.c write_ctables.c gram.c lex.c lr.c arg.c parse.c scan.c symtab.c util.c version.c grammar.g.c
 CPPFLAGS =  -DD_BUILD_VERSION=5725
+CFLAGS += -Wno-implicit-function-declaration
 RUN_OPTIONS=-v $(PROJ_SRC_DIR)/grammar.g
 HASH_PROGRAM_OUTPUT = 1
 include ../../Makefile.multisrc