opensimh: update to latest commit and add fix for broken VAX emulators

emulators/opensimh/Portfile

@@ -4,16 +4,16 @@ PortSystem      1.0
 PortGroup       github 1.0
 PortGroup       cmake 1.1
 
-github.setup    open-simh simh c5d1f8c5ef589de877a1934f2f264105d64d0ee5
+github.setup    open-simh simh c20b391eea8ea3ae7f264837aa9c8dd1476b1ea1
 github.tarball_from archive
 name            opensimh
 
-version         20250808
-revision        1
+version         20250826
+revision        0
 
-checksums       rmd160  5507f2145e091937f98345e4063106845e76e056 \
-                sha256  da503160ff9c31c35e70dcacb30aac82e17bbf7f2c8b9ce29a8d1aaaaa21ad65 \
-                size    31350496
+checksums       rmd160  6f1be78060f93223be4cf251599cf68b38f478c5 \
+                sha256  152ccecf096983fd84f525986b66cea8c5a667c4a4e82d3c2d45629d555949b7 \
+                size    31365115
 
 categories      emulators
 
@@ -53,6 +53,8 @@ patchfiles      zlib-not-static.diff
 
 set bindir      ${worksrcpath}/BIN
 
+configure.cflags-append    -fwrapv -fno-strict-overflow
+
 pre-build {
     file mkdir ${bindir}
 }
@@ -67,15 +69,6 @@ test.run        yes
 test.cmd        ctest
 
 notes "
-The following OpenSIMH simulators are known to be currently\
-broken in this snapsot:
-
-infoserver100 infoserver1000 infoserver150vxt microvax1 microvax3100\
-microvax3100e vax vax730 vax750 vax780 vax8200 vax8600\
-vaxstation3100m30 vaxstation3100m38
-
-The port will be updated when they are fixed.
-
 open-simh executables have been installed with a 'simh-' prefix, for example:
    simh-microvax3900
 "