ruby30,32,33: Remove inappropriate -std=c99.

The Portfile has been carrying the -std=c99 setting (for OS <10.7)
forward through many versions, but that has been inappropriate since
ruby30, when the compiler selection was switched by the thread-local
storage requirement.  Since the compiler now defaults to C11,
specifying C99 is a step backward.  This removes that inappropriate
setting.

Since this is not known not to impact the installed content, it
includes a revbump.

Also, since the latest legacy-support includes fgetattrlist(), builds
of ruby32-33 for <10.6 no longer include the private fallback, making
the installed content different on those platforms.  The revbump
covers that as well.

Also removes unnecessary "platforms darwin", making lint happy.

TESTED:
Minimally tested on unaffected 10.7+.
Built successfully with no variants on 10.4-10.5 ppc, 10.4-10.6 i386,
and 10.5-10.6 x86_64.
Built with all variants except jemalloc and yjit on 10.4-10.5, and all
variants except yjit on 10.6.
Universal included for ruby30 on 10.6.
Tests not run due to test framework issues.

lang/ruby30/Portfile

@@ -7,13 +7,12 @@ PortGroup           compiler_blacklist_versions 1.0
 
 name                ruby30
 version             3.0.7
-revision            0
+revision            1
 
 categories          lang ruby
 maintainers         {kimuraw @kimuraw} \
                     {fwright.net:fw @fhgwright} \
                     openmaintainer
-platforms           darwin
 
 description         Powerful and clean object-oriented scripting language
 long_description    Ruby is the interpreted scripting language for quick \
@@ -213,7 +212,6 @@ platform darwin {
         depends_build-append    port:gmake
         build.cmd               ${prefix}/bin/gmake
         configure.args-append   --disable-dtrace
-        configure.cflags-append -std=c99
     }
 
     if {${os.major} == 8} {

lang/ruby32/Portfile

@@ -14,13 +14,12 @@ set ruby_patch      5
 set ruby_ver_nodot  [string map {. {}} ${ruby_ver}]
 name                ruby${ruby_ver_nodot}
 version             ${ruby_ver}.${ruby_patch}
-revision            0
+revision            1
 
 categories          lang ruby
 maintainers         {kimuraw @kimuraw} \
                     {fwright.net:fw @fhgwright} \
                     openmaintainer
-platforms           darwin
 
 description         Powerful and clean object-oriented scripting language
 long_description    Ruby is the interpreted scripting language for quick \
@@ -179,7 +178,6 @@ platform darwin {
         depends_build-append    port:gmake
         build.cmd               ${prefix}/bin/gmake
         configure.args-append   --disable-dtrace
-        configure.cflags-append -std=c99
     }
 
     if {${os.major} == 8} {

lang/ruby33/Portfile

@@ -21,13 +21,12 @@ set ruby_patch      4
 set ruby_ver_nodot  [string map {. {}} ${ruby_ver}]
 name                ruby${ruby_ver_nodot}
 version             ${ruby_ver}.${ruby_patch}
-revision            2
+revision            3
 
 categories          lang ruby
 maintainers         {kimuraw @kimuraw} \
                     {fwright.net:fw @fhgwright} \
                     openmaintainer
-platforms           darwin
 
 description         Powerful and clean object-oriented scripting language
 long_description    Ruby is the interpreted scripting language for quick \
@@ -186,7 +185,6 @@ platform darwin {
         depends_build-append    port:gmake
         build.cmd               ${prefix}/bin/gmake
         configure.args-append   --disable-dtrace
-        configure.cflags-append -std=c99
     }
 
     if {${os.major} == 8} {