Do not use /system/bin/{mkdir,install} in rbconfib

Using executables in /system/bin is fragile since they may not
work due to LD_LIBRARY_PATH containing libraries with the same
name that the executables are linked against (but with different
versions).

packages/ruby/build.sh

@@ -2,7 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://www.ruby-lang.org/
 TERMUX_PKG_DESCRIPTION="Dynamic programming language with a focus on simplicity and productivity"
 _MAJOR_VERSION=2.2
 TERMUX_PKG_VERSION=${_MAJOR_VERSION}.3
-TERMUX_PKG_BUILD_REVISION=2
+TERMUX_PKG_BUILD_REVISION=3
 TERMUX_PKG_SRCURL=http://cache.ruby-lang.org/pub/ruby/${_MAJOR_VERSION}/ruby-${TERMUX_PKG_VERSION}.tar.xz
 # libbffi is used by the fiddle extension module:
 TERMUX_PKG_DEPENDS="libffi, libgmp, readline, openssl"
@@ -23,14 +23,17 @@ termux_step_make_install () {
 	make uninstall # remove possible remains to get fresh timestamps
 	make install
 
-        # rbconfig.rb, used to build native gems, thinks that ${TERMUX_HOST_PLATFORM}-gcc should
-        # be used, but we want normal gcc
+        # rbconfig.rb, used to build native gems, thinks that ${TERMUX_HOST_PLATFORM}-$TOOLNAME should
+        # be used, but we want the unprefixed $TOOLNAME:
         local RBCONFIG=$TERMUX_PREFIX/lib/ruby/${_MAJOR_VERSION}.0/arm-linux-androideabi/rbconfig.rb
         for tool in gcc "g\+\+" strip nm objdump ar ranlib ld cpp; do
           perl -p -i -e "s/${TERMUX_HOST_PLATFORM}-$tool/$tool/g" $RBCONFIG
         done
-        perl -p -i -e 's@"/bin/mkdir@"/system/bin/mkdir@' $RBCONFIG
-        perl -p -i -e "s@/usr/bin/install@$TERMUX_PREFIX/bin/applets/install@" $RBCONFIG
+
+	# Fix absolute paths to executables:
+        perl -p -i -e 's@"/bin/mkdir@"mkdir@' $RBCONFIG
+        perl -p -i -e "s@/usr/bin/install@install@" $RBCONFIG
+
         # Make C++-using gems link against libgnustl_shared instead of the limited system libstdc++:
         perl -p -i -e 's/\(CXX\) -shared/\(CXX\) -shared -lgnustl_shared/' $RBCONFIG
 	# Fix mention of $_SPECSFLAG in rbconfig: