Fix capitalization of speexdsp

See: https://trac.macports.org/ticket/68637

speexDSP-devel was deleted years ago so there is no longer any reason to
depend on speexDSP via a path:-style dependency.

audio/pulseaudio/Portfile

@@ -47,7 +47,7 @@ depends_lib         port:libiconv \
                     path:lib/pkgconfig/glib-2.0.pc:glib2 \
                     port:dbus \
                     port:fftw-3-single \
-                    path:lib/libspeexdsp.dylib:speexDSP \
+                    port:speexdsp \
                     port:orc \
                     port:soxr
 

games/openrct2/Portfile

@@ -11,7 +11,6 @@ name                openrct2
 revision            0
 
 categories          games
-platforms           darwin
 maintainers         {gmail.com:audvare @Tatsh} openmaintainer
 license             {GPL-3+ CC-BY-4}
 
@@ -82,7 +81,7 @@ depends_lib-append  port:libsdl2 \
                     port:jansson \
                     port:libpng \
                     port:libsdl2_ttf \
-                    port:speexDSP \
+                    port:speexdsp \
                     port:libzip \
                     port:curl \
                     port:freetype \

multimedia/VLC2/Portfile

@@ -142,7 +142,7 @@ if {(${subport} eq ${name}) || (${subport} eq "lib${name}")} {
                         port:readline \
                         port:schroedinger \
                         port:speex \
-                        port:speexDSP \
+                        port:speexdsp \
                         port:taglib \
                         port:tiff \
                         port:twolame \

science/freedv-gui/Portfile

@@ -37,7 +37,7 @@ depends_lib-append \
     port:libao \
     port:codec2 \
     port:lpcnetfreedv \
-    port:speexDSP
+    port:speexdsp
 
 compiler.cxx_standard 2011