Cleanup IOS build and disable FORTRAN on 32bit and ios builds for now

Travis recently appears unable to find a matching homebrew package for 32bit gfortran,
and the IOS crossbuild suffered from excessive output due to the known problem with "ASMNAME redefined"
warnings when CFLAGS is set in the environment

.travis.yml

@@ -160,26 +160,25 @@ matrix:
       os: osx
       osx_image: xcode10.1
       before_script:
-        - COMMON_FLAGS="DYNAMIC_ARCH=1 TARGET=NEHALEM NUM_THREADS=32"
+        - COMMON_FLAGS="DYNAMIC_ARCH=1 NUM_THREADS=32"
         - brew update
         - brew install gcc@8 # for gfortran
       script:
         - travis_wait 45 make QUIET_MAKE=1 $COMMON_FLAGS $BTYPE
       env:
-        - BTYPE="BINARY=64 INTERFACE64=1 FC=gfortran-8"
+        - BTYPE="TARGET=NEHALEM BINARY=64 INTERFACE64=1 FC=gfortran-8"
 
     - <<: *test-macos
-      osx_image: xcode8.3
+      osx_image: xcode10.0
       env:
-        - BTYPE="BINARY=32 FC=gfortran-8"
+        - BTYPE="TARGET=NEHALEM BINARY=32 NOFORTRAN=1"
 
     - <<: *test-macos
       osx_image: xcode10.1
       env:
-        - COMMON_FLAGS="NUM_THREADS=32"
         - CC="/Applications/Xcode-10.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -isysroot /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk"
-        - CFLAGS="-O2 -isysroot /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk -arch arm64 -miphoneos-version-min=10.0"
-        - BTYPE="TARGET=ARMV8 BINARY=64 HOSTCC=clang"
+        - CFLAGS="-O2 -Wno-macro-redefined -isysroot /Applications/Xcode-10.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk -arch arm64 -miphoneos-version-min=10.0"
+        - BTYPE="TARGET=ARMV8 BINARY=64 HOSTCC=clang NOFORTRAN=1"
 
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