Revert "port: use system trig functions"

apparently this only causes issues, though it might be possible to use SOME trig functions from libc

Makefile.port

@@ -170,7 +170,7 @@ JSON_FILES += $(wildcard $(A_DIR)/*.json)
 
 JSON_HEADERS := $(patsubst $(A_DIR)/%.json, $(G_DIR)/%.h, $(JSON_FILES))
 
-C_FILES := $(shell find src/game port -name '*.c' ! -name 'atan2f.c' ! -name 'acosfasinf.c')
+C_FILES := $(shell find src/game port -name '*.c')
 C_FILES := $(C_FILES) \
   $(wildcard src/lib/mp3/*.c) \
   $(wildcard src/lib/naudio/*.c) \

src/lib/modelasm_c.c

@@ -1577,8 +1577,6 @@ static f32 modelasmAcosOrAsin(f32 f6)
 	return 0.000047937632189132f * t3;
 }
 
-#ifdef PLATFORM_N64
-
 f32 cosf(f32 radians)
 {
 	return sinf(radians + 1.570796251297f);
@@ -1652,5 +1650,3 @@ f32 sinf(f32 radians)
 
 	return ret;
 }
-
-#endif