PERL5OPT doesn't support spaces between switches and their args

[DrHyde]

Description

On the command line you can have a space in between a -I or -M switch and its argument, but this doesn't work when those switches are supplied in $PERL5OPT.

Steps to Reproduce

With switches on the command line everything works:

$ perl -M lib=local -e0
$ perl -I lib -e0
$

Supplying the same in $PERL5OPT blows up:

$ PERL5OPT=-M\ lib=local perl -e0
Missing argument to -M.
$ PERL5OPT=-I\ lib perl -e0
No directory specified for -I.

Expected behavior

Spaces in between -I and -M and their arguments should be permitted in $PERL5OPT exactly as when they are provided as command line switches.

Perl configuration

Summary of my perl5 (revision 5 version 41 subversion 3) configuration:
  Commit id: f8647d3280614d4c72a4ce4e0ee3c20535be74ca
  Platform:
    osname=darwin
    osvers=23.5.0
    archname=darwin-2level
    uname='darwin harrow.local 23.5.0 darwin kernel version 23.5.0: wed may 1 20:09:52 pdt 2024; root:xnu-10063.121.3~5release_x86_64 x86_64 '
    config_args='-de -Dusedevel -Dprefix=/Users/david/Desktop/fooo'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
  Compiler:
    cc='cc'
    ccflags ='-fno-common -DPERL_DARWIN -mmacosx-version-min=14.5 -DNO_THREAD_SAFE_QUERYLOCALE -DNO_POSIX_2008_LOCALE -DHAS_BROKEN_LANGINFO_CODESET -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    optimize='-O3'
    cppflags='-fno-common -DPERL_DARWIN -mmacosx-version-min=14.5 -DNO_THREAD_SAFE_QUERYLOCALE -DNO_POSIX_2008_LOCALE -DHAS_BROKEN_LANGINFO_CODESET -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='Apple LLVM 15.0.0 (clang-1500.3.9.4)'
    gccosandvers=''
    intsize=4
    longsize=8
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=16
    longdblkind=3
    ivtype='long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='cc'
    ldflags =' -mmacosx-version-min=14.5 -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/15.0.0/lib /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/lib /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib /usr/lib
    libs=
    perllibs=
    libc=
    so=dylib
    useshrplib=false
    libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=bundle
    d_dlsymun=undef
    ccdlflags=' '
    cccdlflags=' '
    lddlflags=' -mmacosx-version-min=14.5 -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl):
  Compile-time options:
    HAS_LONG_DOUBLE
    HAS_STRTOLD
    HAS_TIMES
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_HASH_FUNC_SIPHASH13
    PERL_HASH_USE_SBOX32
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    PERL_USE_DEVEL
    PERL_USE_SAFE_PUTENV
    USE_64_BIT_ALL
    USE_64_BIT_INT
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Built under darwin
  Compiled at Aug 28 2024 00:04:31
  %ENV:
    PERLBREW_HOME="/Users/david/.perlbrew"
    PERLBREW_MANPATH="/Users/david/perl5/perlbrew/perls/default/man"
    PERLBREW_PATH="/Users/david/perl5/perlbrew/bin:/Users/david/perl5/perlbrew/perls/default/bin"
    PERLBREW_PERL="default"
    PERLBREW_ROOT="/Users/david/perl5/perlbrew"
    PERLBREW_SHELLRC_VERSION="0.96"
    PERLBREW_VERSION="0.96"
  @INC:
    lib
    /Users/david/Desktop/fooo/lib/perl5/site_perl/5.41.3/darwin-2level
    /Users/david/Desktop/fooo/lib/perl5/site_perl/5.41.3
    /Users/david/Desktop/fooo/lib/perl5/5.41.3/darwin-2level
    /Users/david/Desktop/fooo/lib/perl5/5.41.3