procmail: Add -Wno-implicit-int to fix error of do_compile

Without the option -Wno-implicit-int , the following error will occur and the command  procmail will not be installed to target.
lmtp.c:54:8: error: type defaults to 'int' in declaration of 'ctopfd' [-Wimplicit-int]
   54 | static ctopfd;
      |        ^~~~~~
make[1]: [Makefile:239: lmtp.o] Error 1 (ignored)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/procmail/procmail_3.22.bb

@@ -37,7 +37,7 @@ do_configure() {
 }
 
 do_compile() {
-    oe_runmake -i CFLAGS="$TARGET_CFLAGS -Wno-comments -Wno-implicit-function-declaration -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" LDFLAGS0="${LDFLAGS}"
+    oe_runmake -i CFLAGS="$TARGET_CFLAGS -Wno-comments -Wno-implicit-int -Wno-implicit-function-declaration -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" LDFLAGS0="${LDFLAGS}"
 }
 
 do_install() {