apps: Sanitize PROGNAME for _main symbol generation

Program names containing '-' (e.g. renaming hello to hello-world via
PROGNAME) previously generated an invalid identifier <PROGNAME>_main
when constructing internal entry-point symbols. This caused build
failures for C/C++ applications due to invalid identifiers in compiler
definitions and generated builtin_proto.h.

Introduce PROGSYM, a sanitized copy of PROGNAME with '-' replaced by
'_', and use it wherever an internal C/Zig identifier is constructed
(the -Dmain= defines, the Zig RENAMEMAIN rule, and the REGISTER
call's entry-point argument). Preserve the original PROGNAME for the
registered NSH command name and builtin registry entry, where hyphens
are valid and expected.

The Zig RENAMEMAIN path is also updated to use PROGSYM for consistency.
The current hello_zig and leds_zig examples do not exercise this path,
since neither uses a literal 'fn main' entry point, but the change
keeps symbol generation consistent for future Zig applications.

Testing (WSL2 Ubuntu, x86_64, sim:nsh):
- CONFIG_EXAMPLES_HELLO_PROGNAME="hello-world": clean build,
  'hello-world' runs and prints 'Hello, World!!'
- Reverted to default PROGNAME="hello": clean build, no regression
- Confirmed by inspection that RENAMEMAIN's sed substitution does not
  fire on either current .zig source (generated _tmp.zig is
  byte-identical to the source)

Fixes #19447

Signed-off-by: Ansh Rai <anshrai331@gmail.com>

Author: ML-dev-crypto

Application.mk

@@ -122,6 +122,7 @@ ifneq ($(strip $(PROGNAME)),)
   NLIST := $(shell seq 1 $(words $(PROGNAME)))
   $(foreach i, $(NLIST), \
     $(eval PROGNAME_$(word $i,$(PROGOBJ)) := $(word $i,$(PROGNAME))) \
+    $(eval PROGSYM_$(word $i,$(PROGOBJ)) := $(subst -,_,$(word $i,$(PROGNAME)))) \
     $(eval PROGOBJ_$(word $i,$(PROGLIST)) := $(word $i,$(PROGOBJ))) \
     $(eval PRIORITY_$(word $i,$(REGLIST)) := \
         $(if $(word $i,$(PRIORITY)),$(word $i,$(PRIORITY)),$(lastword $(PRIORITY)))) \
@@ -223,7 +224,7 @@ endef
 # rename "main()" in $1 to "xxx_main()" and save to $2
 define RENAMEMAIN
 	$(ECHO_BEGIN)"Rename main() in $1 and save to $2"
-	$(Q) ${shell cat $1 | sed -e "s/fn[ ]\+main/fn $(addsuffix _main,$(PROGNAME_$@))/" > $2}
+	$(Q) ${shell cat $1 | sed -e "s/fn[ ]\+main/fn $(addsuffix _main,$(PROGSYM_$@))/" > $2}
 	$(ECHO_END)
 endef
 
@@ -319,14 +320,14 @@ install:: $(PROGLIST)
 else
 
 $(MAINCXXOBJ): $(PREFIX)%$(CXXEXT)$(SUFFIX)$(OBJEXT): %$(CXXEXT)
-	$(eval $<_CXXFLAGS += ${shell $(DEFINE) "$(CXX)" main=$(addsuffix _main,$(PROGNAME_$@))})
-	$(eval $<_CXXELFFLAGS += ${shell $(DEFINE) "$(CXX)" main=$(addsuffix _main,$(PROGNAME_$@))})
+	$(eval $<_CXXFLAGS += ${shell $(DEFINE) "$(CXX)" main=$(addsuffix _main,$(PROGSYM_$@))})
+	$(eval $<_CXXELFFLAGS += ${shell $(DEFINE) "$(CXX)" main=$(addsuffix _main,$(PROGSYM_$@))})
 	$(if $(and $(CONFIG_MODULES),$(MODCXXFLAGS)), \
 		$(call ELFCOMPILEXX, $<, $@), $(call COMPILEXX, $<, $@))
 
 $(MAINCOBJ): $(PREFIX)%.c$(SUFFIX)$(OBJEXT): %.c
-	$(eval $<_CFLAGS += ${DEFINE_PREFIX}main=$(addsuffix _main,$(PROGNAME_$@)))
-	$(eval $<_CELFFLAGS += ${DEFINE_PREFIX}main=$(addsuffix _main,$(PROGNAME_$@)))
+	$(eval $<_CFLAGS += ${DEFINE_PREFIX}main=$(addsuffix _main,$(PROGSYM_$@)))
+	$(eval $<_CELFFLAGS += ${DEFINE_PREFIX}main=$(addsuffix _main,$(PROGSYM_$@)))
 	$(if $(and $(CONFIG_MODULES),$(MODCFLAGS)), \
 		$(call ELFCOMPILE, $<, $@), $(call COMPILE, $<, $@))
 
@@ -362,10 +363,11 @@ ifeq ($(DO_REGISTRATION),y)
 
 $(REGLIST): $(DEPCONFIG) Makefile
 	$(eval PROGNAME_$@ := $(basename $(notdir $@)))
+	$(eval PROGSYM_$@ := $(subst -,_,$(PROGNAME_$@)))
 ifeq ($(CONFIG_SCHED_USER_IDENTITY),y)
-	$(call REGISTER,$(PROGNAME_$@),$(PRIORITY_$@),$(STACKSIZE_$@),$(if $(BUILD_MODULE),,$(PROGNAME_$@)_main),$(UID_$@),$(GID_$@),$(MODE_$@))
+	$(call REGISTER,$(PROGNAME_$@),$(PRIORITY_$@),$(STACKSIZE_$@),$(if $(BUILD_MODULE),,$(PROGSYM_$@)_main),$(UID_$@),$(GID_$@),$(MODE_$@))
 else
-	$(call REGISTER,$(PROGNAME_$@),$(PRIORITY_$@),$(STACKSIZE_$@),$(if $(BUILD_MODULE),,$(PROGNAME_$@)_main))
+	$(call REGISTER,$(PROGNAME_$@),$(PRIORITY_$@),$(STACKSIZE_$@),$(if $(BUILD_MODULE),,$(PROGSYM_$@)_main))
 endif
 
 register:: $(REGLIST)