mksh: bump to R53a, add cmd:cmp to BUILD_PREREQ for TEST(). (#782)

app-shells/mksh/mksh-53a.recipe

@@ -17,7 +17,7 @@ LICENSE="MirOS
 	ISC"
 REVISION="1"
 SOURCE_URI="https://www.mirbsd.org/MirOS/dist/mir/mksh/mksh-R$portVersion.tgz"
-CHECKSUM_SHA256="c6341acea725103f782c14e994d6e12dabaee69e60fe1bc78603a41258d43ba6"
+CHECKSUM_SHA256="3bb2453c8cb65abbda24f9bdd8b8371e30a6e1c2f7a0d5474a3efae438639635"
 SOURCE_DIR="mksh"
 if [ "$targetArchitecture" != x86_gcc2 ]; then
 	PATCHES="mksh-$portVersion.patch"
@@ -39,6 +39,7 @@ BUILD_REQUIRES="
 
 BUILD_PREREQUIRES="
 	cmd:awk
+	cmd:cmp
 	cmd:ed
 	cmd:gcc
 	cmd:grep

app-shells/mksh/patches/mksh-53a.patch

@@ -1,6 +1,6 @@
 --- a/Build.sh
 +++ b/Build.sh
-@@ -1420,9 +1420,6 @@
+@@ -1411,9 +1411,6 @@ gcc)
  	# mksh is not written in CFrustFrust!
  	ac_flags 1 no_eh_frame -fno-asynchronous-unwind-tables
  	ac_flags 1 fnostrictaliasing -fno-strict-aliasing